X-Git-Url: https://zdv2.bktei.com/gitweb/EVA-2020-02.git/blobdiff_plain/adf766fc1b00708d11179e50d8eeb5dbeff97af6..277b96616a15cc95d7fa272ac75e56aaad3efeed:/exec/bklog

diff --git a/exec/bklog b/exec/bklog
index b908ad9..a78b19f 100644
--- a/exec/bklog
+++ b/exec/bklog
@@ -5,20 +5,33 @@
 #===BEGIN Initialize variables===
 
 # Logging Behavior parameters
+bufferTTL="300"; # Time-to-live (seconds) for each buffer round
 scriptTTL_TE="day"; # Time element at the end of which script terminates
-scriptTTL="15"; # (temp) Time (seconds) until script terminates
-bufferTTL="5"; # Time-to-live (seconds) for each buffer round
-dirTempDefault="/dev/shm"; # Default parent of working directory
+dirTmpDefault="/dev/shm"; # Default parent of working directory
 
 # Script Metadata
-scriptVersion="0.1.1";          # Define version of script.
 scriptName="bklog";             # Define basename of script file.
-PATH="$HOME/.local/bin:$PATH"; # Add "$(systemd-path user-binaries)" path in case user apps saved there
+scriptVersion="0.1.20";          # Define version of script.
+scriptURL="https://gitlab.com/baltakatei/ninfacyzga-01"; # Define wesite hosting this script.
+scriptTimeStart="$(date +%Y%m%dT%H%M%S.%N)"; # YYYYmmddTHHMMSS.NNNNNNNNN
+scriptHostname=$(hostname);     # Save hostname of system running this script.
+PATH="$HOME/.local/bin:$PATH";  # Add "$(systemd-path user-binaries)" path in case user apps saved there
+ageVersion="1.0.0-beta2";       # Define version of age (encryption program)
+ageURL="https://github.com/FiloSottile/age/releases/tag/v1.0.0-beta2"; # Define website hosting age.
 
 # Arrays
-declare -a buffer # Initialize buffer array
+declare -a buffer          # array for storing while read buffer
+declare -a argRecPubKeys   # array for processArguments function
+declare -a recPubKeysValid # array for storing both '-r' and '-R' recipient pubkeys
+declare -a argProcStrings argProcFileExts # for storing buffer processing strings (ex: "gpsbabel -i nmea -f - -o gpx -F - ")
+declare -Ag appRollCall    # Associative array for storing app status
+declare -Ag fileRollCall   # Associative array for storing file status
+declare -Ag dirRollCall    # Associative array for storing dir status
+declare -a procStrings procFileExts # Arrays for storing processing commands and resulting output file extensions
 
 # Variables
+optionVerbose=""; optionEncrypt=""; dirOut=""; optionEncrypt=""; dir_tmp="";
+cmd_compress="";cmd_compress_suffix=""; cmd_encrypt=""; cmd_encrypt_suffix="";
 
 #===END Initialize variables===
 
@@ -26,33 +39,1394 @@ declare -a buffer # Initialize buffer array
 yell() { echo "$0: $*" >&2; }      #o Yell, Die, Try Three-Fingered Claw technique
 die() { yell "$*"; exit 111; }     #o Ref/Attrib: https://stackoverflow.com/a/25515370
 try() { "$@" || die "cannot $*"; } #o
+processArguments() {
+    while [ ! $# -eq 0 ]; do   # While number of arguments ($#) is not (!) equal to (-eq) zero (0).
+	case "$1" in
+	    -v | --verbose) optionVerbose="true"; vbm "DEBUG :Verbose mode enabled.";; # Enable verbose mode.
+	    -h | --help) showUsage; exit 1;; # Display usage.
+	    --version) showVersion; exit 1;; # Show version
+	    -o | --output) if [ -d "$2" ]; then dirOut="$2"; vbm "DEBUG :dirOut:$dirOut"; shift; fi ;; # Define output directory.
+	    -e | --encrypt) optionEncrypt="true"; vbm "DEBUG :Encrypted output mode enabled.";; # Enable encryption
+	    -r | --recipient) optionRecArg="true"; argRecPubKeys+=("$2"); vbm "STATUS:pubkey added:""$2"; shift;; # Add recipients
+	    -R | --recipient-dir) optionRecDir="true" && argRecDir="$2"; shift;; # Add recipient watch dir
+	    -c | --compress) optionCompress="true"; vbm "DEBUG :Compressed output mode enabled.";; # Enable compression
+	    -z | --time-zone) try setTimeZoneEV "$2"; shift;; # Set timestamp timezone
+	    -t | --temp-dir) optionTmpDir="true" && argTempDirPriority="$2"; shift;; # Set time zone
+	    -b | --buffer-ttl) optionCustomBufferTTL="true" && argCustomBufferTTL="$2"; shift;; # Set custom buffer period (default: 300 seconds)
+	    -B | --script-ttl) optionCustomScriptTTL_TE="true" && argCustomScriptTTL_TE="$2"; shift;; # Set custom script TTL (default: "day")
+	    -p | --process-string) optionProcString="true" && argProcStrings+=("$2") && argProcFileExts+=("$3") && vbm "STATUS:file extension \"$2\" for output of processing string added:\"$3\""; shift; shift;;
+	    -l | --label) optionLabel="true" && argLabel="$2"; vbm "DEBUG :Custom label received:$argLabel"; shift;;
+	    -w | --store-raw) optionStoreRaw="true" && argRawFileExt="$2"; vbm "DEBUG :Raw stdin file extension received:$argRawFileExt"; shift;;
+	    -W | --no-store-raw) optionNoStoreRaw="true"; vbm "DEBUG :Option selected to not store raw stdin data."; shift;;
+	    *) yell "ERROR: Unrecognized argument: $1"; yell "STATUS:All arguments:$*"; exit 1;; # Handle unrecognized options.
+	esac
+	shift
+    done
+} # Argument Processing
+vbm() {
+    # Description: Prints verbose message ("vbm") to stderr if optionVerbose is set to "true".
+    # Usage: vbm "DEBUG :verbose message here"
+    # Version 0.1.2
+    # Input: arg1: string
+    #        vars: optionVerbose
+    # Output: stderr
+    # Depends: bash 5.0.3, echo 8.30, date 8.30
+
+    if [ "$optionVerbose" = "true" ]; then
+	functionTime=$(date --iso-8601=ns); # Save current time in nano seconds.
+	echo "[$functionTime] ""$*" 1>&2; # Display argument text.
+    fi
+
+    # End function
+    return 0; # Function finished.
+} # Displays message if optionVerbose true
+checkapp() {
+    # Desc: If arg is a command, save result in assoc array 'appRollCall'
+    # Usage: checkapp arg1 arg2 arg3 ...
+    # Version: 0.1.1
+    # Input: global assoc. array 'appRollCall'
+    # Output: adds/updates key(value) to global assoc array 'appRollCall'
+    # Depends: bash 5.0.3
+    local returnState    
+
+    #===Process Args===
+    for arg in "$@"; do
+	if command -v "$arg" 1>/dev/null 2>&1; then # Check if arg is a valid command
+	    appRollCall[$arg]="true";
+	    if ! [ "$returnState" = "false" ]; then returnState="true"; fi;
+	else
+	    appRollCall[$arg]="false"; returnState="false";
+	fi;
+    done;
+
+    #===Determine function return code===
+    if [ "$returnState" = "true" ]; then
+	return 0;
+    else
+	return 1;
+    fi;
+} # Check that app exists
+checkfile() {
+    # Desc: If arg is a file path, save result in assoc array 'fileRollCall'
+    # Usage: checkfile arg1 arg2 arg3 ...
+    # Version: 0.1.1
+    # Input: global assoc. array 'fileRollCall'
+    # Output: adds/updates key(value) to global assoc array 'fileRollCall';
+    # Output: returns 0 if app found, 1 otherwise
+    # Depends: bash 5.0.3
+    local returnState
+
+    #===Process Args===
+    for arg in "$@"; do
+	if [ -f "$arg" ]; then
+	    fileRollCall["$arg"]="true";
+	    if ! [ "$returnState" = "false" ]; then returnState="true"; fi;
+	else
+	    fileRollCall["$arg"]="false"; returnState="false";
+	fi;
+    done;
+    
+    #===Determine function return code===
+    if [ "$returnState" = "true" ]; then
+	return 0;
+    else
+	return 1;
+    fi;
+} # Check that file exists
+checkdir() {
+    # Desc: If arg is a dir path, save result in assoc array 'dirRollCall'
+    # Usage: checkdir arg1 arg2 arg3 ...
+    # Version 0.1.1
+    # Input: global assoc. array 'dirRollCall'
+    # Output: adds/updates key(value) to global assoc array 'dirRollCall';
+    # Output: returns 0 if app found, 1 otherwise
+    # Depends: Bash 5.0.3
+    local returnState
+
+    #===Process Args===
+    for arg in "$@"; do
+	if [ -d "$arg" ]; then
+	    dirRollCall["$arg"]="true";
+	    if ! [ "$returnState" = "false" ]; then returnState="true"; fi
+	else
+	    dirRollCall["$arg"]="false"; returnState="false";
+	fi
+    done
+    
+    #===Determine function return code===
+    if [ "$returnState" = "true" ]; then
+	return 0;
+    else
+	return 1;
+    fi
+} # Check that dir exists
+displayMissing() {
+    # Desc: Displays missing apps, files, and dirs
+    # Usage: displayMissing
+    # Version 0.1.1
+    # Input: associative arrays: appRollCall, fileRollCall, dirRollCall
+    # Output: stderr: messages indicating missing apps, file, or dirs
+    # Depends: bash 5, checkAppFileDir()
+    local missingApps value appMissing missingFiles fileMissing
+    local missingDirs dirMissing
+    
+    #==BEGIN Display errors==
+    #===BEGIN Display Missing Apps===
+    missingApps="Missing apps  :";
+    #for key in "${!appRollCall[@]}"; do echo "DEBUG :$key => ${appRollCall[$key]}"; done
+    for key in "${!appRollCall[@]}"; do
+	value="${appRollCall[$key]}";
+	if [ "$value" = "false" ]; then
+	    #echo "DEBUG :Missing apps: $key => $value";
+	    missingApps="$missingApps""$key ";
+	    appMissing="true";
+	fi;
+    done;
+    if [ "$appMissing" = "true" ]; then  # Only indicate if an app is missing.
+	echo "$missingApps" 1>&2;
+    fi;
+    unset value;
+    #===END Display Missing Apps===
+
+    #===BEGIN Display Missing Files===
+    missingFiles="Missing files:";
+    #for key in "${!fileRollCall[@]}"; do echo "DEBUG :$key => ${fileRollCall[$key]}"; done
+    for key in "${!fileRollCall[@]}"; do
+	value="${fileRollCall[$key]}";
+	if [ "$value" = "false" ]; then
+	    #echo "DEBUG :Missing files: $key => $value";
+	    missingFiles="$missingFiles""$key ";
+	    fileMissing="true";
+	fi;
+    done;
+    if [ "$fileMissing" = "true" ]; then  # Only indicate if an app is missing.
+	echo "$missingFiles" 1>&2;
+    fi;
+    unset value;
+    #===END Display Missing Files===
+
+    #===BEGIN Display Missing Directories===
+    missingDirs="Missing dirs:";
+    #for key in "${!dirRollCall[@]}"; do echo "DEBUG :$key => ${dirRollCall[$key]}"; done
+    for key in "${!dirRollCall[@]}"; do
+	value="${dirRollCall[$key]}";
+	if [ "$value" = "false" ]; then
+	    #echo "DEBUG :Missing dirs: $key => $value";
+	    missingDirs="$missingDirs""$key ";
+	    dirMissing="true";
+	fi;
+    done;
+    if [ "$dirMissing" = "true" ]; then  # Only indicate if an dir is missing.
+	echo "$missingDirs" 1>&2;
+    fi;
+    unset value;
+    #===END Display Missing Directories===
+
+    #==END Display errors==
+} # Display missing apps, files, dirs
+
+appendArgTar(){
+    # Desc: Writes first argument to temporary file with arguments as options, then appends file to tar
+    # Usage: appendArgTar "$(echo "Data to be written.")" [name of file to be inserted] [tar path] [temp dir] ([cmd1] [cmd2] [cmd3] [cmd4]...)
+    # Version: 1.0.6
+    # Input: arg1: data to be written
+    #        arg2: file name of file to be inserted into tar
+    #        arg3: tar archive path (must exist first)
+    #        arg4: temporary working dir
+    #        arg5+: command strings (ex: "gpsbabel -i nmea -f - -o kml -F - ")
+    # Output: file written to disk
+    # Example: decrypt multiple large files in parallel
+    #          appendArgTar "$(cat /tmp/largefile1.gpg)" "largefile1" $HOME/archive.tar /tmp "gpg --decrypt" &
+    #          appendArgTar "$(cat /tmp/largefile2.gpg)" "largefile2" $HOME/archive.tar /tmp "gpg --decrypt" &
+    #          appendArgTar "$(cat /tmp/largefile3.gpg)" "largefile3" $HOME/archive.tar /tmp "gpg --decrypt" &
+    # Depends: bash 5, tar 1, yell()
+    # Ref/Attrib: Using 'eval' to construct command strings https://askubuntu.com/a/476533
+
+    local fn fileName tarPath tmpDir cmd0 cmd1 cmd2 cmd3 cmd4
+
+    # Save function name
+    fn="${FUNCNAME[0]}";
+    #yell "DEBUG:STATUS:$fn:Finished appendArgTar()."
+    
+    # Set file name
+    if ! [ -z "$2" ]; then fileName="$2"; else yell "ERROR:$fn:Not enough arguments."; exit 1; fi
+    
+    # Check tar path is a file
+    if [ -f "$3" ]; then tarPath="$3"; else yell "ERROR:$fn:Tar archive arg not a file."; exit 1; fi
+	
+    # Check temp dir arg
+    if ! [ -z "$4" ]; then tmpDir="$4"; else yell "ERROR:$fn:No temporary working dir set."; exit 1; fi
+    
+    # Set command strings
+    if ! [ -z "$5" ]; then cmd1="$5"; else cmd1="cat "; fi # command string 1
+    if ! [ -z "$6" ]; then cmd2="$6"; else cmd2="cat "; fi # command string 2
+    if ! [ -z "$7" ]; then cmd3="$7"; else cmd3="cat "; fi # command string 3
+    if ! [ -z "$8" ]; then cmd4="$8"; else cmd4="cat "; fi # command string 4
+
+    # Input command
+    cmd0="echo \"\$1\""
+
+    # # Debug
+    # yell "DEBUG:STATUS:$fn:cmd0:$cmd0"
+    # yell "DEBUG:STATUS:$fn:cmd1:$cmd1"
+    # yell "DEBUG:STATUS:$fn:cmd2:$cmd2"
+    # yell "DEBUG:STATUS:$fn:cmd3:$cmd3"
+    # yell "DEBUG:STATUS:$fn:cmd4:$cmd4"
+    # yell "DEBUG:STATUS:$fn:fileName:$fileName"
+    # yell "DEBUG:STATUS:$fn:tarPath:$tarPath"
+    # yell "DEBUG:STATUS:$fn:tmpDir:$tmpDir"
+    
+    # Write to temporary working dir
+    eval "$cmd0 | $cmd1 | $cmd2 | $cmd3 | $cmd4" > "$tmpDir"/"$fileName";
+
+    # Append to tar
+    try tar --append --directory="$tmpDir" --file="$tarPath" "$fileName";
+    #yell "DEBUG:STATUS:$fn:Finished appendArgTar()."
+} # Append Bash var to file appended to Tar archive
+appendFileTar(){
+    # Desc: Appends [processed] file to tar
+    # Usage: appendFileTar [file path] [name of file to be inserted] [tar path] [temp dir] ([process cmd])
+    # Version: 2.0.1
+    # Input: arg1: path of file to be (processed and) written
+    #        arg2: name to use for file inserted into tar
+    #        arg3: tar archive path (must exist first)
+    #        arg4: temporary working dir
+    #        arg5: (optional) command string to process file (ex: "gpsbabel -i nmea -f - -o kml -F - ")
+    # Output: file written to disk
+    # Example: decrypt multiple large files in parallel
+    #          appendFileTar /tmp/largefile1.gpg "largefile1" $HOME/archive.tar /tmp "gpg --decrypt" &
+    #          appendFileTar /tmp/largefile2.gpg "largefile2" $HOME/archive.tar /tmp "gpg --decrypt" &
+    #          appendFileTar /tmp/largefile3.gpg "largefile3" $HOME/archive.tar /tmp "gpg --decrypt" &
+    # Depends: bash 5.0.3, tar 1.30, cat 8.30, yell()
+    local fn fileName tarPath tmpDir
+
+    # Save function name
+    fn="${FUNCNAME[0]}";
+    #yell "DEBUG :STATUS:$fn:Started appendFileTar()."
+    
+    # Set file name
+    if ! [ -z "$2" ]; then fileName="$2"; else yell "ERROR:$fn:Not enough arguments."; exit 1; fi
+    # Check tar path is a file
+    if [ -f "$3" ]; then tarPath="$3"; else yell "ERROR:$fn:Tar archive arg not a file:$3"; exit 1; fi
+    # Check temp dir arg
+    if ! [ -z "$4" ]; then tmpDir="$4"; else yell "ERROR:$fn:No temporary working dir set."; exit 1; fi
+    # Set command strings
+    if ! [ -z "$5" ]; then cmd1="$5"; else cmd1="cat "; fi # command string
+
+    # Input command string
+    cmd0="cat \"\$1\"";
+    
+    # Write to temporary working dir
+    eval "$cmd0 | $cmd1" > "$tmpDir"/"$fileName";
+
+    # Append to tar
+    try tar --append --directory="$tmpDir" --file="$tarPath" "$fileName";
+    #yell "DEBUG :STATUS:$fn:Finished appendFileTar()."
+} # Append [processed] file to Tar archive
+checkAgePubkey() {
+    # Desc: Checks if string is an age-compatible pubkey
+    # Usage: checkAgePubkey [str pubkey]
+    # Version: 0.1.2
+    # Input: arg1: string
+    # Output: return code 0: string is age-compatible pubkey
+    #         return code 1: string is NOT an age-compatible pubkey
+    #         age stderr (ex: there is stderr if invalid string provided)
+    # Depends: age (v0.1.0-beta2; https://github.com/FiloSottile/age/releases/tag/v1.0.0-beta2 )
+    
+    argPubkey="$1";
+    
+    if echo "test" | age -a -r "$argPubkey" 1>/dev/null; then
+	return 0;
+    else
+	return 1;
+    fi;
+} # Check age pubkey
+checkMakeTar() {
+    # Desc: Checks that a valid tar archive exists, creates one otherwise
+    # Usage: checkMakeTar [ path ]
+    # Version: 1.0.2
+    # Input: arg1: path of tar archive
+    # Output: exit code 0 : tar readable
+    #         exit code 1 : tar missing; created
+    #         exit code 2 : tar not readable; moved; replaced
+    # Depends: bash 5, date 8, tar 1, try()
+    local pathTar returnFlag0 returnFlag1 returnFlag2
+    pathTar="$1";
+
+    # Check if file is a valid tar archive
+    if tar --list --file="$pathTar" 1>/dev/null 2>&1; then
+	## T1: return success
+	returnFlag0="tar valid";
+    else
+	## F1: Check if file exists
+	if [[ -f "$pathTar" ]]; then
+	    ### T: Rename file
+	    try mv "$pathTar" "$pathTar""--broken--""$(date +%Y%m%dT%H%M%S)" && \
+		returnFlag1="tar moved";
+	else
+	    ### F: -
+	    :
+	fi;
+	## F2: Create tar archive, return 0
+	try tar --create --file="$pathTar" --files-from=/dev/null && \
+	    returnFlag2="tar created";
+    fi;
+    
+    # Determine function return code
+    if [[ "$returnFlag0" = "tar valid" ]]; then
+	return 0;
+    elif [[ "$returnFlag2" = "tar created" ]] && ! [[ "$returnFlag1" = "tar moved" ]]; then
+	return 1; # tar missing so created
+    elif [[ "$returnFlag2" = "tar created" ]] && [[ "$returnFlag1" = "tar moved" ]]; then
+	return 2; # tar not readable so moved; replaced
+    fi;
+} # checks if arg1 is tar; creates one otherwise
+dateShort(){
+    # Desc: Date without separators (YYYYmmdd)
+    # Usage: dateShort ([str date])
+    # Version: 1.1.2
+    # Input: arg1: 'date'-parsable timestamp string (optional)
+    # Output: stdout: date (ISO-8601, no separators)
+    # Depends: bash 5.0.3, date 8.30, yell()
+    local argTime timeCurrent timeInput dateCurrentShort
+
+    argTime="$1";
+    # Get Current Time
+    timeCurrent="$(date --iso-8601=seconds)" ; # Produce `date`-parsable current timestamp with resolution of 1 second.
+    # Decide to parse current or supplied date
+    ## Check if time argument empty
+    if [[ -z "$argTime" ]]; then
+	## T: Time argument empty, use current time
+	timeInput="$timeCurrent";
+    else
+	## F: Time argument exists, validate time
+	if date --date="$argTime" 1>/dev/null 2>&1; then
+	    ### T: Time argument is valid; use it
+	    timeInput="$argTime";
+	else
+	    ### F: Time argument not valid; exit
+	    yell "ERROR:Invalid time argument supplied. Exiting."; exit 1;
+	fi;
+    fi;
+    # Construct and deliver separator-les date string    
+    dateCurrentShort="$(date -d "$timeInput" +%Y%m%d)"; # Produce separator-less current date with resolution 1 day.
+    echo "$dateCurrentShort";
+} # Get YYYYmmdd
+dateTimeShort(){
+    # Desc: Timestamp without separators (YYYYmmddTHHMMSS+zzzz)
+    # Usage: dateTimeShort ([str date])
+    # Version 1.1.1
+    # Input: arg1: 'date'-parsable timestamp string (optional)
+    # Output: stdout: timestamp (ISO-8601, no separators)
+    # Depends: yell
+    local argTime timeCurrent timeInput timeCurrentShort
+
+    argTime="$1";
+    # Get Current Time
+    timeCurrent="$(date --iso-8601=seconds)" ; # Produce `date`-parsable current timestamp with resolution of 1 second.
+    # Decide to parse current or supplied date
+    ## Check if time argument empty
+    if [[ -z "$argTime" ]]; then
+	## T: Time argument empty, use current time
+	timeInput="$timeCurrent";
+    else
+	## F: Time argument exists, validate time
+	if date --date="$argTime" 1>/dev/null 2>&1; then
+	    ### T: Time argument is valid; use it
+	    timeInput="$argTime";
+	else
+	    ### F: Time argument not valid; exit
+	    yell "ERROR:Invalid time argument supplied. Exiting."; exit 1;
+	fi
+    fi
+    # Construct and deliver separator-les date string
+    timeCurrentShort="$(date -d "$timeInput" +%Y%m%dT%H%M%S%z)";
+    echo "$timeCurrentShort";
+} # Get YYYYmmddTHHMMSS±zzzz
+setTimeZoneEV(){
+    # Desc: Set time zone environment variable TZ
+    # Usage: setTimeZoneEV arg1
+    # Version 0.1.2
+    # Input: arg1: 'date'-compatible timezone string (ex: "America/New_York")
+    #        TZDIR env var (optional; default: "/usr/share/zoneinfo")
+    # Output: exports TZ
+    #         exit code 0 on success
+    #         exit code 1 on incorrect number of arguments
+    #         exit code 2 if unable to validate arg1
+    # Depends: yell(), printenv 8.30, bash 5.0.3
+    # Tested on: Debian 10
+    local tzDir returnState argTimeZone
+
+    argTimeZone="$1"
+    if ! [[ $# -eq 1 ]]; then
+	yell "ERROR:Invalid argument count.";
+	return 1;
+    fi
+
+    # Read TZDIR env var if available
+    if printenv TZDIR 1>/dev/null 2>&1; then
+	tzDir="$(printenv TZDIR)";
+    else
+	tzDir="/usr/share/zoneinfo";
+    fi
+    
+    # Validate TZ string
+    if ! [[ -f "$tzDir"/"$argTimeZone" ]]; then
+	yell "ERROR:Invalid time zone argument.";
+	return 2;
+    else
+    # Export ARG1 as TZ environment variable
+	TZ="$argTimeZone" && export TZ && returnState="true";
+    fi
+
+    # Determine function return code
+    if [ "$returnState" = "true" ]; then
+	return 0;
+    fi
+} # Exports TZ environment variable
+showVersion() {
+    yell "$scriptVersion"
+} # Display script version.
+timeDuration(){
+    # Desc: Given seconds, output ISO-8601 duration string
+    # Ref/Attrib: ISO-8601:2004(E), §4.4.4.2 Representations of time intervals by duration and context information
+    # Note: "1 month" ("P1M") is assumed to be "30 days" (see ISO-8601:2004(E), §2.2.1.2)
+    # Usage: timeDuration [1:seconds] ([2:precision])
+    # Version: 1.0.4
+    # Input: arg1: seconds as base 10 integer >= 0  (ex: 3601)
+    #        arg2: precision level (optional; default=2)
+    # Output: stdout: ISO-8601 duration string (ex: "P1H1S", "P2Y10M15DT10H30M20S")
+    #         exit code 0: success
+    #         exit code 1: error_input
+    #         exit code 2: error_unknown
+    # Example: 'timeDuration 111111 3' yields 'P1DT6H51M'
+    # Depends: date 8, bash 5, yell,
+    local argSeconds argPrecision precision returnState remainder
+    local fullYears fullMonths fullDays fullHours fullMinutes fullSeconds
+    local hasYears hasMonths hasDays hasHours hasMinutes hasSeconds
+    local witherPrecision output
+    local displayYears displayMonths displayDays displayHours displayMinutes displaySeconds
+    
+    argSeconds="$1"; # read arg1 (seconds)
+    argPrecision="$2"; # read arg2 (precision)
+    precision=2; # set default precision
+
+    # Check that between one and two arguments is supplied
+    if ! { [[ $# -ge 1 ]] && [[ $# -le 2 ]]; }; then
+	yell "ERROR:Invalid number of arguments:$# . Exiting.";
+	returnState="error_input"; fi
+
+    # Check that argSeconds provided
+    if [[ $# -ge 1 ]]; then
+	## Check that argSeconds is a positive integer
+	if [[ "$argSeconds" =~ ^[[:digit:]]+$ ]]; then
+   	    :
+	else
+	    yell "ERROR:argSeconds not a digit.";
+	    returnState="error_input";
+	fi
+    else
+	yell "ERROR:No argument provided. Exiting.";
+	exit 1;
+    fi
+
+    # Consider whether argPrecision was provided
+    if  [[ $# -eq 2 ]]; then
+	# Check that argPrecision is a positive integer
+	if [[ "$argPrecision" =~ ^[[:digit:]]+$ ]] && [[ "$argPrecision" -gt 0 ]]; then
+	precision="$argPrecision";
+	else
+	    yell "ERROR:argPrecision not a positive integer. (is $argPrecision ). Leaving early.";
+	    returnState="error_input";
+	fi;
+    else
+	:
+    fi;
+    
+    remainder="$argSeconds" ; # seconds
+    ## Calculate full years Y, update remainder
+    fullYears=$(( remainder / (365*24*60*60) ));
+    remainder=$(( remainder - (fullYears*365*24*60*60) ));
+    ## Calculate full months M, update remainder
+    fullMonths=$(( remainder / (30*24*60*60) ));
+    remainder=$(( remainder - (fullMonths*30*24*60*60) ));
+    ## Calculate full days D, update remainder
+    fullDays=$(( remainder / (24*60*60) ));
+    remainder=$(( remainder - (fullDays*24*60*60) ));
+    ## Calculate full hours H, update remainder
+    fullHours=$(( remainder / (60*60) ));
+    remainder=$(( remainder - (fullHours*60*60) ));
+    ## Calculate full minutes M, update remainder
+    fullMinutes=$(( remainder / (60) ));
+    remainder=$(( remainder - (fullMinutes*60) ));
+    ## Calculate full seconds S, update remainder
+    fullSeconds=$(( remainder / (1) ));
+    remainder=$(( remainder - (remainder*1) ));
+    ## Check which fields filled
+    if [[ $fullYears -gt 0 ]]; then hasYears="true"; else hasYears="false"; fi
+    if [[ $fullMonths -gt 0 ]]; then hasMonths="true"; else hasMonths="false"; fi
+    if [[ $fullDays -gt 0 ]]; then hasDays="true"; else hasDays="false"; fi
+    if [[ $fullHours -gt 0 ]]; then hasHours="true"; else hasHours="false"; fi
+    if [[ $fullMinutes -gt 0 ]]; then hasMinutes="true"; else hasMinutes="false"; fi
+    if [[ $fullSeconds -gt 0 ]]; then hasSeconds="true"; else hasSeconds="false"; fi
+    
+    ## Determine which fields to display (see ISO-8601:2004 §4.4.3.2)
+    witherPrecision="false"
+    
+    ### Years
+    if $hasYears && [[ $precision -gt 0 ]]; then
+	displayYears="true";
+	witherPrecision="true";
+    else
+	displayYears="false";
+    fi;
+    if $witherPrecision; then ((precision--)); fi;
+    
+    ### Months
+    if $hasMonths && [[ $precision -gt 0 ]]; then
+	displayMonths="true";
+	witherPrecision="true";
+    else
+	displayMonths="false";
+    fi;
+    if $witherPrecision && [[ $precision -gt 0 ]]; then
+	displayMonths="true";
+    fi;
+    if $witherPrecision; then ((precision--)); fi;
+
+    ### Days
+    if $hasDays && [[ $precision -gt 0 ]]; then
+	displayDays="true";
+	witherPrecision="true";
+    else
+	displayDays="false";
+    fi;
+    if $witherPrecision && [[ $precision -gt 0 ]]; then
+	displayDays="true";
+    fi;
+    if $witherPrecision; then ((precision--)); fi;
+
+    ### Hours
+    if $hasHours && [[ $precision -gt 0 ]]; then
+	displayHours="true";
+	witherPrecision="true";
+    else
+	displayHours="false";
+    fi;
+    if $witherPrecision && [[ $precision -gt 0 ]]; then
+	displayHours="true";
+    fi;
+    if $witherPrecision; then ((precision--)); fi;
+
+    ### Minutes
+    if $hasMinutes && [[ $precision -gt 0 ]]; then
+	displayMinutes="true";
+	witherPrecision="true";
+    else
+	displayMinutes="false";
+    fi;
+    if $witherPrecision && [[ $precision -gt 0 ]]; then
+	displayMinutes="true";
+    fi;
+    if $witherPrecision; then ((precision--)); fi;
+
+    ### Seconds
+
+    if $hasSeconds && [[ $precision -gt 0 ]]; then
+	displaySeconds="true";
+	witherPrecision="true";
+    else
+	displaySeconds="false";
+    fi;
+    if $witherPrecision && [[ $precision -gt 0 ]]; then
+	displaySeconds="true";
+    fi;
+    if $witherPrecision; then ((precision--)); fi;
+
+    ## Determine whether or not the "T" separator is needed to separate date and time elements
+    if ( $displayHours || $displayMinutes || $displaySeconds); then
+	displayDateTime="true"; else displayDateTime="false"; fi
+    
+    ## Construct duration output string
+    output="P"
+    if $displayYears; then
+	output=$output$fullYears"Y"; fi
+    if $displayMonths; then
+	output=$output$fullMonths"M"; fi
+    if $displayDays; then
+	output=$output$fullDays"D"; fi
+    if $displayDateTime; then
+	output=$output"T"; fi
+    if $displayHours; then
+	output=$output$fullHours"H"; fi
+    if $displayMinutes; then
+	output=$output$fullMinutes"M"; fi
+    if $displaySeconds; then
+	output=$output$fullSeconds"S"; fi
+
+    ## Output duration string to stdout
+    echo "$output" && returnState="true";
+
+    #===Determine function return code===
+    if [ "$returnState" = "true" ]; then
+	return 0;
+    elif [ "$returnState" = "error_input" ]; then
+	yell "ERROR:input";
+	return 1;
+    else
+	yell "ERROR:Unknown";
+	return 2;
+    fi
+
+} # Get duration (ex: PT10M4S )
+timeUntilNextDay(){
+    # Desc: Report seconds until next day.
+    # Version: 1.0.2
+    # Output: stdout: integer seconds until next day
+    # Output: exit code 0 if stdout > 0; 1 if stdout = 0; 2 if stdout < 0
+    # Usage: timeUntilNextDay
+    # Usage: if ! myTTL="$(timeUntilNextDay)"; then yell "ERROR in if statement"; exit 1; fi
+    # Depends: date 8, echo 8, yell, try
+    
+    local returnState timeCurrent timeNextDay secondsUntilNextDay returnState
+    timeCurrent="$(date --iso-8601=seconds)" ; # Produce `date`-parsable current timestamp with resolution of 1 second.
+    timeNextDay="$(date -d "$timeCurrent next day" --iso-8601=date)"; # Produce timestamp of beginning of tomorrow with resolution of 1 second.
+    secondsUntilNextDay="$(( $(date +%s -d "$timeNextDay") - $(date +%s -d "$timeCurrent") ))" ; # Calculate seconds until closest future midnight (res. 1 second).
+    if [[ "$secondsUntilNextDay" -gt 0 ]]; then
+	returnState="true";
+    elif [[ "$secondsUntilNextDay" -eq 0 ]]; then
+	returnState="warning_zero";
+	yell "WARNING:Reported time until next day exactly zero.";
+    elif [[ "$secondsUntilNextDay" -lt 0 ]]; then
+	returnState="warning_negative";
+	yell "WARNING:Reported time until next day is negative.";
+    fi
+
+    try echo "$secondsUntilNextDay"; # Report
+    
+    # Determine function return code
+    if [[ "$returnState" = "true" ]]; then
+	return 0;
+    elif [[ "$returnState" = "warning_zero" ]]; then
+	return 1;
+    elif [[ "$returnState" = "warning_negative" ]]; then
+	return 2;
+    fi
+} # Report seconds until next day
+timeUntilNextHour(){
+    # Desc: Report seconds until next hour
+    # Version 1.0.1
+    # Output: stdout: integer seconds until next hour
+    # Output: exit code 0 if stdout > 0; 1 if stdout = 0; 2 if stdout < 0
+    # Usage: timeUntilNextHour
+    # Usage: if ! myTTL="$(timeUntilNextHour)"; then yell "ERROR in if statement"; exit 1; fi
+    
+    local returnState timeCurrent timeNextHour secondsUntilNextHour
+    timeCurrent="$(date --iso-8601=seconds)"; # Produce `date`-parsable current timestamp with resolution of 1 second.
+    timeNextHour="$(date -d "$timeCurrent next hour" --iso-8601=hours)"; # Produce `date`-parsable current time stamp with resolution of 1 second.
+    secondsUntilNextHour="$(( $(date +%s -d "$timeNextHour") - $(date +%s -d "$timeCurrent") ))"; # Calculate seconds until next hour (res. 1 second).
+    if [[ "$secondsUntilNextHour" -gt 0 ]]; then
+	returnState="true";
+    elif [[ "$secondsUntilNextHour" -eq 0 ]]; then
+	returnState="warning_zero";
+	yell "WARNING:Reported time until next hour exactly zero.";
+    elif [[ "$secondsUntilNextHour" -lt 0 ]]; then
+	returnState="warning_negative";
+	yell "WARNING:Reported time until next hour is negative.";
+    fi;
+
+    try echo "$secondsUntilNextHour"; # Report
+    
+    # Determine function return code
+    if [[ "$returnState" = "true" ]]; then
+	return 0;
+    elif [[ "$returnState" = "warning_zero" ]]; then
+	return 1;
+    elif [[ "$returnState" = "warning_negative" ]]; then
+	return 2;
+    fi;
+} # Report seconds until next hour
+validateInput() {
+    # Desc: Validates Input
+    # Usage: validateInput [str input] [str input type]
+    # Version: 0.3.1
+    # Input: arg1: string to validate
+    #        arg2: string specifying input type (ex:"ssh_pubkey")
+    # Output: return code 0: if input string matched specified string type
+    # Depends: bash 5, yell()
+
+    local fn argInput argType
+
+    # Save function name
+    fn="${FUNCNAME[0]}";
+
+    # Process arguments
+    argInput="$1";
+    argType="$2";
+    if [[ $# -gt 2 ]]; then yell "ERROR:$0:$fn:Too many arguments."; exit 1; fi;
+
+    # Check for blank
+    if [[ -z "$argInput" ]]; then return 1; fi
+    
+    # Define input types
+    ## ssh_pubkey
+    ### Check for alnum/dash base64 (ex: "ssh-rsa AAAAB3NzaC1yc2EAAA")
+    if [[ "$argType" = "ssh_pubkey" ]]; then
+	if [[ "$argInput" =~ ^[[:alnum:]-]*[\ ]*[[:alnum:]+/=]*$ ]]; then
+	    return 0; fi; fi;
+
+    ## age_pubkey
+    ### Check for age1[:bech32:]
+    if [[ "$argType" = "age_pubkey" ]]; then
+	if [[ "$argInput" =~ ^age1[qpzry9x8gf2tvdw0s3jn54khce6mua7l]*$ ]]; then
+	    return 0; fi; fi
+
+    ## integer
+    if [[ "$argType" = "integer" ]]; then
+	if [[ "$argInput" =~ ^[[:digit:]]*$ ]]; then
+	    return 0; fi; fi;
+
+    ## time element (year, month, week, day, hour, minute, second)
+    if [[ "$argType" = "time_element" ]]; then
+	if [[ "$argInput" = "year" ]] || \
+	       [[ "$argInput" = "month" ]] || \
+	       [[ "$argInput" = "week" ]] || \
+	       [[ "$argInput" = "day" ]] || \
+	       [[ "$argInput" = "hour" ]] || \
+	       [[ "$argInput" = "minute" ]] || \
+	       [[ "$argInput" = "second" ]]; then
+	    return 0; fi; fi;
+    
+    # Return error if no condition matched.
+    return 1;
+} # Validates strings
+
+magicInitWorkingDir() {
+    # Desc: Determine temporary working directory from defaults or user input
+    # Usage: magicInitWorkingDir
+    # Input:  vars: optionTmpDir, argTempDirPriority, dirTmpDefault
+    # Input:  vars: scriptTimeStart
+    # Output: vars: dir_tmp
+    # Depends: bash 5.0.3, processArguments(), vbm(), yell()
+    # Parse '-t' option (user-specified temporary working dir)
+    ## Set dir_tmp_parent to user-specified value if specified
+    local fn dir_tmp_parent
+
+    # Save function name
+    fn="${FUNCNAME[0]}";
+    
+    vbm "STATUS:$fn:Starting magicInitWorkingDir() function.";
+    if [[ "$optionTmpDir" = "true" ]]; then
+	if [[ -d "$argTempDirPriority" ]]; then
+	    dir_tmp_parent="$argTempDirPriority"; 
+	else
+	    yell "WARNING:$fn:Specified temporary working directory not valid:$argTempDirPriority";
+	    exit 1; # Exit since user requires a specific temp dir and it is not available.
+	fi;
+    else
+    ## Set dir_tmp_parent to default or fallback otherwise
+	if [[ -d "$dirTmpDefault" ]]; then
+	    dir_tmp_parent="$dirTmpDefault";
+	elif [[ -d /tmp ]]; then
+	    yell "WARNING:$fn:$dirTmpDefault not available. Falling back to /tmp .";
+	    dir_tmp_parent="/tmp";
+	else
+	    yell "ERROR:$fn:No valid working directory available. Exiting.";
+	    exit 1;
+	fi;
+    fi;
+    ## Set dir_tmp using dir_tmp_parent and nonce (scriptTimeStart)
+    dir_tmp="$dir_tmp_parent"/"$scriptTimeStart""..bkgpslog" && vbm "DEBUG :$fn:Set dir_tmp to:$dir_tmp"; # Note: removed at end of main().
+    vbm "STATUS:$fn:Finished magicInitWorkingDir() function.";
+} # Sets working dir
+magicInitCheckTar() {
+    # Desc: Initializes or checks output tar
+    # input: vars: dirOut, bufferTTL, cmd_encrypt_suffix, cmd_compress_suffix
+    # input: vars: scriptHostname
+    # output: vars: pathout_tar
+    # depends: Bash 5.0.3, vbm(), dateShort(), checkMakeTar(), magicWriteVersion()
+    local fn checkMakeTarES
+
+    # Save function name
+    fn="${FUNCNAME[0]}";    
+    
+    vbm "STATUS:$fn:Starting magicInitCheckTar() function.";
+    # Form pathout_tar
+    pathout_tar="$dirOut"/"$(dateShort "$(date --date="$bufferTTL seconds ago" --iso-8601=seconds)")".."$scriptHostname""$label""$cmd_compress_suffix""$cmd_encrypt_suffix".tar && \
+	vbm "STATUS:$fn:Set pathout_tar to:$pathout_tar";
+    # Validate pathout_tar as tar.
+    checkMakeTar "$pathout_tar"; checkMakeTarES="$?";
+    ## Add VERSION file if checkMakeTar had to create a tar (exited 1) or replace one (exited 2)
+    vbm "STATUS:$fn:exit status before magicWriteVersion:$checkMakeTarES"
+    if [[ "$checkMakeTarES" -eq 1 ]] || [[ "$checkMakeTarES" -eq 2 ]]; then magicWriteVersion; fi
+    vbm "STATUS:$fn:Finished magicInitCheckTar() function.";
+} # Initialize tar, set pathout_tar
+magicParseCompressionArg() {
+    # Desc: Parses compression arguments specified by '-c' option
+    # Input:  vars: optionCompress
+    # Output: cmd_compress, cmd_compress_suffix
+    # Depends: processArguments(), vbm(), checkapp(), gzip 1.9
+    local fn
+
+    # Save function name
+    fn="${FUNCNAME[0]}";    
+    
+    vbm "STATUS:$fn:Starting magicParseCompressionArg() function.";
+    if [[ "$optionCompress" = "true" ]]; then # Check if compression option active
+	if checkapp gzip; then # Check if gzip available
+	    cmd_compress="gzip " && vbm "STATUS:$fn:cmd_compress:$cmd_compress";
+	    cmd_compress_suffix=".gz" && vbm "STATUS:$fn:cmd_compress_suffix:$cmd_compress_suffix";
+	else
+	    yell "ERROR:$fn:Compression enabled but \"gzip\" not found. Exiting."; exit 1;
+	fi;
+    else
+	cmd_compress="tee /dev/null " && vbm "STATUS:$fn:cmd_compress:$cmd_compress";
+	cmd_compress_suffix="" && vbm "STATUS:$fn:cmd_compress_suffix:$cmd_compress_suffix";
+	vbm "DEBUG :$fn:Compression not enabled.";
+    fi;
+    vbm "STATUS:$fn:Starting magicParseCompressionArg() function.";
+} # Form compression cmd string and filename suffix
+magicParseCustomTTL() {
+    # Desc: Set user-specified TTLs for buffer and script
+    # Usage: magicParseCustomTTL
+    # Input: vars: argCustomBufferTTL (integer), argCustomScriptTTL_TE (string)
+    # Input: vars: optionCustomBufferTTL, optionCustomScriptTTL_TE
+    # Input: vars: bufferTTL (integer), scriptTTL_TE (string)
+    # Output: bufferTTL (integer), scriptTTL_TE (string)
+    # Depends: Bash 5.0.3, yell(), vbm(), validateInput(), showUsage()
+    local fn
+
+    # Save function name
+    fn="${FUNCNAME[0]}";    
+
+    vbm "STATUS:$fn:Starting magicParseCustomTTL() function.";
+    # React to '-b, --buffer-ttl' option
+    if [[ "$optionCustomBufferTTL" = "true" ]]; then
+	## T: Check if argCustomBufferTTL is an integer
+	if validateInput "$argCustomBufferTTL" "integer"; then
+	    ### T: argCustomBufferTTL is an integer
+	    bufferTTL="$argCustomBufferTTL" && vbm "STATUS:$fn:Custom bufferTTL from -b:$bufferTTL";
+	else
+	    ### F: argcustomBufferTTL is not an integer
+	    yell "ERROR:$fn:Invalid integer argument for custom buffer time-to-live."; showUsage; exit 1;
+	fi;
+	## F: do not change bufferTTL
+    fi;
+    
+    # React to '-B, --script-ttl' option
+    if [[ "$optionCustomScriptTTL_TE" = "true" ]]; then
+	## T: Check if argCustomScriptTTL is a time element (ex: "day", "hour")
+	if validateInput "$argCustomScriptTTL_TE" "time_element"; then
+	    ### T: argCustomScriptTTL is a time element
+	    scriptTTL_TE="$argCustomScriptTTL_TE" && vbm "STATUS:$fn:Custom scriptTTL_TE from -B:$scriptTTL_TE";
+	else
+	    ### F: argcustomScriptTTL is not a time element
+	    yell "ERROR:$fn:Invalid time element argument for custom script time-to-live."; showUsage; exit 1;
+	fi;
+	## F: do not change scriptTTL_TE
+    fi;
+    vbm "STATUS:$fn:Starting magicParseCustomTTL() function.";
+} # Sets custom script or buffer TTL if specified
+magicParseLabel() {
+    # Desc: Parses -l option to set label
+    # In : optionLabel, argLabel
+    # Out: vars: label
+    # Depends: Bash 5.0.3, vbm(), yell()
+    local fn
+    
+    # Save function name
+    fn="${FUNCNAME[0]}";
+    
+    vbm "STATUS:$fn:Started magicParseLabel() function.";
+    # Do nothing if optionLabel not set to true.
+    if [[ ! "$optionLabel" = "true" ]]; then
+	vbm "STATUS:$fn:optionlabel not set to 'true'. Returning early.";
+	return;
+    fi;
+    # Set label if optionLabel is true
+    if [[ "$optionLabel" = "true" ]]; then
+	label="_""$argLabel";
+	vbm "STATUS:$fn:Set label:$label";
+    fi;
+    vbm "STATUS:$fn:Finished magicParseLabel() function.";
+} # Set label used in output file name
+magicParseProcessStrings() {
+    # Desc: Processes user-supplied process strings into process commands for appendFileTar().
+    # Usage: magicParseProcessStrings
+    # In : vars: optionProcString optionNoStoreRaw optionStoreRaw argRawFileExt
+    #      arry: argProcStrings, argProcFileExts
+    # Out: arry: procStrings, procFileExts
+    # Depends Bash 5.0.3, yell(), vbm()
+    local fn rawFileExt
+
+    # Save function name
+    fn="${FUNCNAME[0]}";    
+    
+    vbm "STATUS:$fn:Starting magicParseProcessStrings() function.";
+    vbm "STATUS:$fn:var:optionProcString:$optionProcString";
+    vbm "STATUS:$fn:var:optionNoStoreRaw:$optionNoStoreRaw";
+    vbm "STATUS:$fn:var:optionStoreRaw:$optionStoreRaw";
+    vbm "STATUS:$fn:var:argRawFileExt:$argRawFileExt";
+    vbm "STATUS:$fn:ary:argProcStrings:${argProcStrings[*]}";
+    vbm "STATUS:$fn:ary:argProcFileExts:${argProcFileExts[*]}"
+    # Validate input
+    ## Validate argRawFileExt
+    if [[ "$argRawFileExt" =~ ^[.][[:alnum:]]*$ ]]; then
+	rawFileExt="$argRawFileExt" && \
+	    vbm "DEBUG :$fn:Set rawFileExt to \"$argRawFileExt\"";
+    else
+	vbm "DEBUG :$fn:Validation failure for $argRawFileExt . Not set to rawFileExt.";
+    fi;
+    
+    # Add default stdin output file entries for procStrings, procFileExts
+    ## Check if user specified that no raw stdin be saved.
+    if [[ ! "$optionNoStoreRaw" = "true" ]]; then
+	### T: --no-store-raw not set. Store raw. Append procStrings with cat.
+	vbm "DEBUG :$fn:--no-store-raw not set. Storing raw.";
+	#### Append procStrings array
+	procStrings+=("cat ") && \
+	    vbm "DEBUG :$fn:Appended \"cat \" to procStrings";
+	vbm "DEBUG :$fn:procStrings array:${procStrings[*]}";
+	#### Check if --store-raw set.
+	if [[ "$optionStoreRaw" = "true" ]]; then
+	    ##### T: --store-raw set. Append procFileExts with user-specified file ext
+	    vbm "DEBUG :$fn:--store-raw set.";
+	    procFileExts+=("$rawFileExt") && \
+		vbm "DEBUG :$fn:Appended $rawFileExt to procFileExts";
+	    vbm "STATUS:$fn:procFileExts array:${procFileExts[*]}";
+	else
+	    ##### F: --store-raw not set. Append procFileExts with default ".stdin" file ext
+	    ###### Append procFileExts array
+	    procFileExts+=(".stdin") && \
+		vbm "DEBUG :$fn:Appended \".stdin\" to procFileExts";
+	    vbm "STATUS:$fn:procFileExts array:${procFileExts[*]}";
+	fi;
+    else
+	### F: --no-store-raw set. Do not store raw.
+	#### Do not append procStrings or procFileExts arrays.
+	vbm "STATUS:$fn:--no-store-raw set. Not storing raw.";
+	vbm "STATUS:$fn:procFileExts array:${procFileExts[*]}";
+    fi;
+
+    # Do nothing more if optionProcString not set to true.
+    if [[ ! "$optionProcString" = "true" ]]; then
+	vbm "STATUS:$fn:optionProcString not set to 'true'. Returning early.";
+	return; fi;
+    # Validate input array indices
+    ## Make sure that argProcStrings and argProcFileExts have same index counts
+    if ! [[ "${#argProcStrings[@]}" -eq "${#argProcFileExts[@]}" ]]; then
+	yell "ERROR:$fn:Mismatch in number of elements in arrays argProcStrings and argProcFileExts:${#argProcStrings[@]} DNE ${#argProcFileExts[@]}";
+	yell "STATUS:$fn:argProcStrings:${argProcStrings[*]}"; yell "STATUS:$fn:argProcFileExts:${argProcFileExts[*]}"; exit 1; fi;
+    ## Make sure that no array elements are blank
+    for element in "${argProcStrings[@]}"; do
+	if [[ -z "$element" ]]; then yell "ERROR:$fn:Empty process string specified. Exiting."; exit 1; fi; done
+    for element in "${argProcFileExts[@]}"; do
+	if [[ -z "$element" ]]; then yell "ERROR:$fn:Empty output file extension specified. Exiting."; exit 1; fi; done
+    ## Make sure that no process string starts with '-' (ex: if only one arg supplied after '-p' option)
+    for element in "${argProcStrings[@]}"; do
+	if [[ "$element" =~ ^[-][[:print:]]*$ ]] && [[ ! "$element" =~ ^[[:print:]]*$ ]]; then
+	    yell "ERROR:$fn:Illegal character '-' at start of process string element:\"$element\"";
+	    exit 1; fi; done;
+    vbm "STATUS:$fn:Quick check shows argProcStrings and argProcFileExts appear to have valid contents.";
+    vbm "STATUS:$fn:argProcStrings:${argProcStrings[*]}"
+    vbm "STATUS:$fn:argProcStrings:${argProcFileExts[*]}"
+    procStrings+=("${argProcStrings[@]}"); # Export process command strings
+    procFileExts+=("${argProcFileExts[@]}"); # Export process command strings
+    vbm "STATUS:$fn:Finished magicParseProcessStrings() function.";
+} # Validate and save process strings and file extensions to arrays procStrings, procFileExts
+magicParseRecipients() {
+    # Desc: Parses recipient arguments specified by '-r' or '-R' options
+    # Usage: magicParseRecipients
+    # In : vars: optionEncrypt, optionRecArg, optionRecDir
+    #      arry: argRecPubKeys (-r), argRecDir (-R)
+    # Out: vars: cmd_encrypt, cmd_encrypt_suffix
+    # Depends: head 8.30, checkapp(), checkAgePubkey(), validateInput()
+    local fn recipients recipientDir recFileLine updateRecipients
+    local -a recPubKeysValid candRecPubKeysValid
+
+    # Save function name
+    fn="${FUNCNAME[0]}";
+    vbm "STATUS:$fn:Starting magicParseRecipients() function.";
+    
+    # Catch illegal option combinations
+    ## Catch case if '-e' is set but neither '-r' nor '-R' is set
+    if [[ "$optionEncrypt" = "true" ]] && \
+	   ! { [[ "$optionRecArg" = "true" ]] || [[ "$optionRecDir" = "true" ]]; }; then
+	yell "ERROR:$fn:\\'-e\\' set but no \\'-r\\' or \\'-R\\' set."; exit 1; fi;
+    ## Catch case if '-r' or '-R' set but '-e' is not
+    if [[ ! "$optionEncrypt" = "true" ]] && \
+	   { [[ "$optionRecArg" = "true" ]] || [[ "$optionRecDir" = "true" ]]; }; then
+	yell "ERROR:$fn:\\'-r\\' or \\'-R\\' set but \\'-e\\' is not set."; exit 1; fi;
+    
+    # Handle no encryption cases
+    if [[ ! "$optionEncrypt" = "true" ]]; then
+	cmd_encrypt="cat " && vbm "STATUS:$fn:cmd_encrypt:$cmd_encrypt";
+	cmd_encrypt_suffix="" && vbm "STATUS:$fn:cmd_encrypt_suffix:$cmd_encrypt_suffix";
+	vbm "DEBUG :$fn:Encryption not enabled.";
+	return; fi;
+    
+    # Handle encryption cases
+    ## Check age availability
+    if ! checkapp age; then yell "ERROR:$fn:age not available. Exiting."; exit 1; fi
+    ## Parse '-r' options: validate and append pubkeys from argRecPubKeys to recPubKeysValid
+    if [[ "$optionRecArg" = "true" ]]; then
+	for pubkey in "${argRecPubKeys[@]}"; do # Validate recipient pubkey strings by forming test message
+	    vbm "DEBUG :$fn:Testing pubkey string:$pubkey";
+	    if checkAgePubkey "$pubkey" && \
+		    ( validateInput "$pubkey" "ssh_pubkey" || validateInput "$pubkey" "age_pubkey"); then
+		#### Add validated pubkey to recPubKeysValid array
+		recPubKeysValid+=("$pubkey") && \
+		    vbm "DEBUG :$fn:recPubkeysValid:pubkey added:$pubkey";
+	    else
+		yell "ERROR:$fn:Exit code ""$?"". Invalid recipient pubkey string. Exiting."; exit 1;
+	    fi;
+	done;
+	vbm "STATUS:$fn:Finished processing argRecPubKeys array";
+	vbm "DEBUG :$fn:Array of validated pubkeys:${recPubKeysValid[*]}";
+    fi;
+    ## Parse '-R' options: validate and append pubkeys in argRecDir to recPubKeysValid
+    if [[ "$optionRecDir" = "true" ]]; then
+	### Check that argRecDir is a directory
+	if [[ -d "$argRecDir" ]]; then
+	    recipientDir="$argRecDir" && \
+		vbm "STATUS:$fn:Recipient watch directory detected:\"$recipientDir\"";
+	    #### Initialize variable indicating outcome of pubkey review
+	    unset updateRecipients
+	    #### Add existing recipients from '-r' option
+	    candRecPubKeysValid=("${recPubKeysValid[@]}");
+	    #### Parse files in recipientDir
+	    for file in "$recipientDir"/*; do
+		##### Read first line of each file
+		recFileLine="$(head -n1 "$file")" && \
+		    vbm "STATUS:$fn:Checking if pubkey:\"$recFileLine\"";
+		##### check if first line is a valid pubkey
+		if checkAgePubkey "$recFileLine" && \
+			( validateInput "$recFileLine" "ssh_pubkey" || validateInput "$recFileLine" "age_pubkey"); then
+		    ###### T: add candidate pubkey to candRecPubKeysValid
+		    candRecPubKeysValid+=("$recFileLine") && \
+			vbm "STATUS:$fn:RecDir pubkey is valid pubkey:\"$recFileLine\"";
+		else
+		    ###### F: throw warning;
+		    yell "ERROR:$fn:Invalid recipient file detected. Not modifying recipient list:$recFileLine";
+		    updateRecipients="false";
+		fi;
+	    done
+	    #### Write candRecPubKeysValid array to recPubKeysValid if no invalid key detected
+	    if ! [[ "$updateRecipients" = "false" ]]; then
+		recPubKeysValid=("${candRecPubKeysValid[@]}") && \
+		    vbm "STATUS:$fn:Wrote candRecPubkeysValid to recPubKeysValid:\"${recPubKeysValid[*]}\"";
+	    fi;
+	fi;
+    fi;
+    
+    ## Form age recipient string from recPubKeysValid
+    for pubkey in "${recPubKeysValid[@]}"; do
+	recipients="$recipients""-r '$pubkey' ";
+	vbm "STATUS:$fn:Added pubkey for forming age recipient string:""$pubkey";
+	vbm "DEBUG :$fn:recipients:""$recipients";	
+    done;
+    
+    ## Output cmd_encrypt, cmd_encrypt_suffix from recipients
+    cmd_encrypt="age ""$recipients " && vbm "STATUS:$fn:cmd_encrypt:$cmd_encrypt";
+    cmd_encrypt_suffix=".age" && vbm "STATUS:$fn:cmd_encrypt_suffix:$cmd_encrypt_suffix";
+    
+    vbm "STATUS:$fn:Finished magicParseRecipients() function.";
+} # Sets cmd_encrypt, cmd_encrypt_suffix from -r, -R args
+magicSetScriptTTL() {
+    #Desc: Sets script_TTL seconds from provided time_element string argument
+    #Usage: magicSetScriptTTL [str time_element]
+    #Input: arg1: string (Ex: scriptTTL_TE; "day" or "hour")
+    #Output: var: scriptTTL (integer seconds)
+    #Depends: timeUntilNextHour, timeUntilNextDay
+    local fn argTimeElement
+
+    # Save function name
+    fn="${FUNCNAME[0]}";
+    
+    vbm "STATUS:$fn:Starting magicSetScriptTTL() function.";
+    argTimeElement="$1";
+    if [[ "$argTimeElement" = "day" ]]; then
+	    # Set script lifespan to end at start of next day
+	if ! scriptTTL="$(timeUntilNextDay)"; then # sets scriptTTL, then checks exit code
+	    if [[ "$scriptTTL" -eq 0 ]]; then
+	    ((scriptTTL++)); # Add 1 because 0 would cause 'timeout' to never timeout.
+	    else
+	    yell "ERROR:$fn:timeUntilNextDay exit code $?"; exit 1;
+	    fi;
+	fi;
+    elif [[ "$argTimeElement" = "hour" ]]; then
+	# Set script lifespan to end at start of next hour
+	if ! scriptTTL="$(timeUntilNextHour)"; then # sets scriptTTL, then checks exit code
+	    if [[ "$scriptTTL" -eq 0 ]]; then
+		((scriptTTL++)); # Add 1 because 0 would cause 'timeout' to never timeout.
+	    else
+		yell "ERROR:$fn:timeUntilNextHour exit code $?"; exit 1;
+	    fi;
+	fi;
+    else
+	yell "ERROR:$fn:Invalid argument for setScriptTTL function:$argTimeElement"; exit 1;
+    fi;
+    vbm "STATUS:$fn:Finished magicSetScriptTTL() function.";
+} # Set scriptTTL in seconds until next (day|hour).
+magicWriteVersion() {
+    # Desc: Appends time-stamped VERSION to pathout_tar
+    # Usage: magicWriteVersion
+    # Input: vars: pathout_tar, dir_tmp
+    # Input: vars: scriptVersion, scriptURL, ageVersion, ageURL, scriptHostname
+    # Input: array: recPubKeysValid
+    # Output: appends tar (pathout_tar)
+    # Depends: bash 5.0.3, dateTimeShort(), appendArgTar()
+    local fn fileoutVersion contentVersion pubKeyIndex pubKeyIndex
+
+    # Save function name
+    fn="${FUNCNAME[0]}";
+    
+    vbm "STATUS:$fn:Starting magicWriteVersion() function.";
+    # Set VERSION file name
+    fileoutVersion="$(dateTimeShort)..VERSION";
+
+    # Gather VERSION data in contentVersion
+    contentVersion="scriptVersion=$scriptVersion";
+    #contentVersion="$contentVersion""\\n";
+    contentVersion="$contentVersion""\\n""scriptName=$scriptName";
+    contentVersion="$contentVersion""\\n""scriptURL=$scriptURL";
+    contentVersion="$contentVersion""\\n""ageVersion=$ageVersion";
+    contentVersion="$contentVersion""\\n""ageURL=$ageURL";
+    contentVersion="$contentVersion""\\n""date=$(date --iso-8601=seconds)";
+    contentVersion="$contentVersion""\\n""hostname=$scriptHostname";
+    ## Add list of recipient pubkeys
+    for pubkey in "${recPubKeysValid[@]}"; do
+	((pubKeyIndex++))
+	contentVersion="$contentVersion""\\n""PUBKEY_$pubKeyIndex=$pubkey";
+    done
+    ## Process newline escapes
+    contentVersion="$(echo -e "$contentVersion")"
+
+    # Write contentVersion as file fileoutVersion and write-append to pathout_tar
+    appendArgTar "$contentVersion" "$fileoutVersion" "$pathout_tar" "$dir_tmp" && \
+	vbm "STATUS:$fn:Appended $fileoutVersion to $pathout_tar";
+    vbm "STATUS:$fn:Finished magicWriteVersion() function.";
+} # write version data to pathout_tar via appendArgTar()
 magicProcessWriteBuffer() {
-    printf "%s\\n" "${buffer[@]}" | cat | cat | cat >> "/dev/shm/$(date +%s)..bkFreqWrite-output1.txt";
-    printf "%s\\n" "${buffer[@]}" | cat | cat | cat >> "/dev/shm/$(date +%s)..bkFreqWrite-output2.txt";
-    printf "%s\\n" "${buffer[@]}" | cat | cat | cat >> "/dev/shm/$(date +%s)..bkFreqWrite-output3.txt";
+    # Desc: process and write buffer
+    # In : vars: bufferTTL bufferTTL_STR scriptHostname label dir_tmp SECONDS
+    #    : arry: buffer
+    # Out: file:(pathout_tar)
+    # Depends: Bash 5.0.3, date 8.30, yell(), vbm(), dateTimeShort(),
+    ### Note: These arrays should all have the same number of elements:
+    ###       pathouts, fileouts, procFileExts, procStrings
+    
+    local fn timeBufferStartLong timeBufferStart fileoutBasename
+    local -a fileouts pathouts
+    local writeCmd1 writeCmd2 writeCmd3 writeCmd4
+
+    # Debug:Get function name
+    fn="${FUNCNAME[0]}";
+    
+    vbm "STATUS:$fn:Started magicProcessWriteBuffer().";
+    vbm "DEBUG :$fn:buffer array element count:${#buffer[@]}";
+    vbm "DEBUG :$fn:buffer array first element:${buffer[0]}";
+    vbm "DEBUG :$fn:buffer array last element :${buffer[-1]}";
+    
+    # Determine file paths (time is start of buffer period)
+    ## Calculate start time
+    timeBufferStartLong="$(date --date="$bufferTTL seconds ago" --iso-8601=seconds)" && \
+	vbm "DEBUG :$fn:timeBufferStartLong:$timeBufferStartLong";
+    timeBufferStart="$(dateTimeShort "$timeBufferStartLong" )" && \
+	vbm "DEBUG :$fn:timeBufferStart:$timeBufferStart"; # Note start time YYYYmmddTHHMMSS+zzzz (no separators)
+    ## Set common basename
+    fileoutBasename="$timeBufferStart""--""$bufferTTL_STR""..""$scriptHostname""$label" && \
+	vbm "STATUS:$fn:Set fileoutBasename to:$fileoutBasename";
+    ## Determine output file name array
+    ### in: fileOutBasename cmd_compress_suffix cmd_encrypt_suffix procFileExts
+    for fileExt in "${procFileExts[@]}"; do
+	fileouts+=("$fileoutBasename""$fileExt""$cmd_compress_suffix""$cmd_encrypt_suffix") && \
+	    vbm "STATUS:$fn:Added $fileExt to fileouts:${fileouts[*]}";
+    done;
+    for fileName in "${fileouts[@]}"; do
+	pathouts+=("$dir_tmp"/"$fileName") && \
+	    vbm "STATUS:$fn:Added $fileName to pathouts:${pathouts[*]}";
+    done;
+    ## Update pathout_tar
+    magicInitCheckTar;
+    
+    # Process and write buffers to dir_tmp
+    ## Prepare command strings
+    writeCmd1="printf \"%s\\\\n\" \"\${buffer[@]}\""; # printf "%s\\n" "${buffer[@]}"
+    #writeCmd2="" # NOTE: Specified by parsing array procStrings
+    writeCmd3="$cmd_compress";
+    writeCmd4="$cmd_encrypt";
+    
+    ## Process buffer and write to dir_tmp
+    for index in "${!pathouts[@]}"; do
+	writeCmd2="${procStrings[$index]}";
+	writeCmdAll="$writeCmd1 | $writeCmd2 | $writeCmd3 | $writeCmd4" && vbm "STATUS:$fn:Assembled command:\"$writeCmdAll\"";
+	eval "$writeCmd1 | $writeCmd2 | $writeCmd3 | $writeCmd4" > "${pathouts[$index]}" && vbm "STATUS:$fn:Wrote command output to ${pathouts[$index]}";
+    done;
+    
+    # Append dir_tmp files to pathout_tar
+    wait; # Wait to avoid collision with older magicProcessWriteBuffer() instances (see https://www.tldp.org/LDP/abs/html/x9644.html )
+    for index in "${!pathouts[@]}"; do
+	appendFileTar "${pathouts[$index]}" "${fileouts[$index]}" "$pathout_tar" "$dir_tmp" && \
+	    vbm "STATUS:$fn:Appended ${pathouts[$index]} to $pathout_tar";
+    done;
+    
+    # Remove secured chunks from dir_tmp
+    for path in "${pathouts[@]}"; do
+	rm "$path" && vbm "STATUS:$fn:Removed:$path";
+    done;
+    
+    vbm "STATUS:$fn:Finished magicProcessWriteBuffer().";
 } # Process and Write buffer
+showUsage() {
+    cat <<'EOF'
+    USAGE:
+        cmd | bklog [ options ]
+
+    OPTIONS:
+        -h, --help
+                Display help information.
+        --version
+                Display script version.
+        -v, --verbose
+                Display debugging info.
+        -e, --encrypt
+                Encrypt output.
+        -r, --recipient [ string pubkey ]
+                Specify recipient. May be age or ssh pubkey.
+                May be specified multiple times for multiple pubkeys.
+                See https://github.com/FiloSottile/age
+        -o, --output [ path dir ]
+                Specify output directory to save logs. This option is required
+                to save log data.
+        -p, --process-string [ filter command ] [ output file extension] 
+                Specify how to create and name a processed version of the stdin.
+                For example, if stdin is 'nmea' location data:
+                
+                -p "gpsbabel -i nmea -f - -o gpx -F - " ".gpx"
+
+                This option would cause the stdin to 'bklog' to be piped into
+                the 'gpsbabel' command, interpreted as 'nmea' data, converted
+                into 'gpx' format, and then appended to the output tar file
+                as a file with a '.gpx' extension.
+                This option may be specified multiple times in order to output
+                results of multiple different processing methods.
+        -l, --label [ string ]
+                Specify a label to be included in all output file names.
+                Ex: 'location' if stdin is location data.
+        -w, --store-raw [ file extension ]
+                Specify file extension of file within output tar that contains
+                raw stdin data. The default behavior is to always save raw stdin
+                data in a '.stdin' file. Example usage when 'bklog' receives
+                'nmea' data from 'gpspipe -r':
+
+                -w ".nmea"
+
+                Stdin data is saved in a '.nmea' file within the output tar.
+        -W, --no-store-raw
+                Do not store raw stdin in output tar.
+        -c, --compress
+                Compress output with gzip (before encryption if enabled).
+        -z, --time-zone
+                Specify time zone. (ex: "America/New_York")
+        -t, --temp-dir [path dir]
+                Specify parent directory for temporary working directory.
+                Default: "/dev/shm"
+        -R, --recipient-dir [path dir]
+                Specify directory containing files whose first lines are
+                to be interpreted as pubkey strings (see '-r' option). Only
+                one directory may be specified.
+        -b, --buffer-ttl [integer]
+                Specify custom buffer period in seconds (default: 300 seconds)
+        -B, --script-ttl [time element string]
+                Specify custom script time-to-live in seconds (default: "day")
+                Valid values: "day", "hour"
+
+    EXAMPLE: (bash script lines)
+    $ gpspipe -r | /bin/bash bklog -v -e -c -z "UTC" -t "/dev/shm" \
+    -r age1mrmfnwhtlprn4jquex0ukmwcm7y2nxlphuzgsgv8ew2k9mewy3rs8u7su5 \
+    -r age1ala848kqrvxc88rzaauc6vc5v0fqrvef9dxyk79m0vjea3hagclswu0lgq \
+    -R ~/.config/bklog/recipients -w ".nmea" -b 300 -B "day" \
+    -o ~/Sync/Logs -l "location" \
+    -p "gpsbabel -i nmea -f - -o gpx -F - " ".gpx" \
+    -p "gpsbabel -i nmea -f - -o kml -F - " ".kml"
+EOF
+} # Display information on how to use this script.
+
 main() {
+    # Desc: Main function
+    # Usage: main "$@"
+    # Inputs: many
+    # Outputs: file (pathout_tar)
+    # Depends: many
+    local fn
+
+    # Debug:Get function name
+    fn="${FUNCNAME[0]}";
+
+    vbm "STATUS:$fn:Started function main().";
+    # Process arguments
+    processArguments "$@";
+    ## Determine working directory
+    magicInitWorkingDir; # Sets dir_tmp from argTempDirPriority
+    ## Set output encryption and compression option strings
+    ### React to "-e", "-r", and "-R" (encryption recipients) options
+    magicParseRecipients; # Update cmd_encrypt, cmd_encrypt_suffix
+    ### React to "-c" ("compression") option
+    magicParseCompressionArg; # Updates cmd_compress[_suffix]
+    ## React to "-b" and "-B" (custom buffer and script TTL) options
+    magicParseCustomTTL; # Sets custom scriptTTL_TE and/or bufferTTL if specified
+    ## React to "-p" (user-supplied process command and file extension strings) options
+    magicParseProcessStrings; # Sets arrays: procStrings, procFileExts
+    ## React to "-l" (output file label) option
+    magicParseLabel; # sets label (ex: "_location")
+
+    # Perform secondary setup operations
+    ## Set script lifespan (scriptTTL from scriptTTL_TE)
+    magicSetScriptTTL "$scriptTTL_TE";
+    ## File name substring (ISO-8601 duration from bufferTTL)
+    bufferTTL_STR="$(timeDuration "$bufferTTL")" && vbm "DEBUG :$fn:bufferTTL_STR:$bufferTTL_STR";
+    ## Init temp working dir
+    try mkdir "$dir_tmp" && vbm "DEBUG :$fn:Working dir created at dir_tmp:$dir_tmp";
+    ## Initialize output tar (set pathout_tar)
+    magicInitCheckTar;
+    ## Append VERSION file to tar
+    magicWriteVersion;
+    
+    # Check vital apps, files, dirs
+    if ! checkapp tar && ! checkdir "$dirOut" "dir_tmp"; then
+	yell "ERROR:$fn:Critical components missing.";
+	displayMissing; yell "Exiting."; exit 1; fi
+
+    # MAIN LOOP: Run until script TTL seconds pass
     bufferRound=0;
-    # Run until script TTL seconds pass
     while [[ $SECONDS -lt "scriptTTL" ]]; do
-	bufferTOD="$((SECONDS + bufferTTL))";
-	lineCount=0;
+	vbm "STATUS:$fn:Starting buffer round:$bufferRound";
+	bufferTOD="$((SECONDS + bufferTTL))"; # Set buffer round time-of-death
 	# Consume stdin to fill buffer until buffer time-of-death (TOD) arrives
 	while read -r -t "$bufferTTL" line && [[ $SECONDS -lt "$bufferTOD" ]]; do
 	    # Append line to buffer array
 	    buffer+=("$line");
-	    echo "DEBUG:Processing line:$lineCount";
-	    echo "DEBUG:Current line   :$line";
-	    echo "DEBUG:buf elem count :${#buffer[@]}";
-	    ((lineCount++));
 	done;
+	# Create dir_tmp if missing
+	if ! [[ -d "$dir_tmp" ]]; then
+	    yell "ERROR:$fn:dir_tmp existence failure:$dir_tmp";
+	    try mkdir "$dir_tmp" && vbm "DEBUG :$fn:Working dir recreated dir_tmp:$dir_tmp"; fi
+	# Update cmd_encrypt, cmd_encrypt_suffix
+	magicParseRecipients;
 	# Export buffer to asynchronous processing.
 	magicProcessWriteBuffer &
 	unset buffer; # Clear buffer array for next bufferRound
 	# Increment buffer round
 	((bufferRound++));
     done;
-}
+
+    # Cleanup
+    ## Remove dir_tmp
+    try rm -r "$dir_tmp" && vbm "STATUS:$fn:Removed dir_tmp:$dir_tmp";
+
+    vbm "STATUS:$fn:Finished function main().";
+} # Main function
 
 #===END Declare local script functions===
 #==END Define script parameters==