unitproc/bkt-writeArg

   1 #!/bin/bash
   2
   3 # Desc: Template function to write data supplied as argument
   4
   5 yell() { echo "$0: $*" >&2; } # Yell, Die, Try Three-Fingered Claw technique; # Ref/Attrib: https://stackoverflow.com/a/25515370
   6 die() { yell "$*"; exit 111; }
   7 try() { "$@" || die "cannot $*"; }
   8 writeArg(){
   9     # Desc: Writes first argument with subsequent arguments as options
  10     # Usage: writeArg "$(echo "Data to be written.")" [output path] ([cmd1] [cmd2] [cmd3] [cmd4]...)
  11     # Input: arg1: data to be written
  12     #        arg2: output path
  13     #        arg3+: command strings (ex: "gpsbabel -i nmea -f - -o kml -F - ")
  14     # Output: file written to disk
  15     # Example: decrypt multiple large files in parallel
  16     #          writeArg "$(cat /tmp/largefile1.gpg)" /tmp/largefile1 "gpg --decrypt" &
  17     #          writeArg "$(cat /tmp/largefile2.gpg)" /tmp/largefile2 "gpg --decrypt" &
  18     #          writeArg "$(cat /tmp/largefile3.gpg)" /tmp/largefile3 "gpg --decrypt" &
  19     # Depends: bash 5
  20
  21     # Set command strings
  22     if ! [ -z "$3" ]; then CMD1="$3"; else CMD1="tee /dev/null "; fi # command string 1
  23     if ! [ -z "$4" ]; then CMD2="$4"; else CMD2="tee /dev/null "; fi # command string 2
  24     if ! [ -z "$5" ]; then CMD3="$5"; else CMD3="tee /dev/null "; fi # command string 3
  25     if ! [ -z "$6" ]; then CMD4="$6"; else CMD4="tee /dev/null "; fi # command string 4
  26
  27     # Debug
  28     yell "CMD1:$CMD1"
  29     yell "CMD2:$CMD2"
  30     yell "CMD3:$CMD3"
  31     yell "CMD4:$CMD4"
  32     # Write
  33     echo "$1" | $CMD1 | $CMD2 | $CMD3 | $CMD4 > "$2";
  34
  35 } # Write Bash var to file
  36
  37 #==BEGIN sample code==
  38 myFile="/tmp/$(date +%s)..original"
  39 echo "how are you doing?" > "$myFile"
  40 myVAR="$(cat $myFile)"
  41 writeArg "$myVAR" "$myFile..LOUD_CHILD" "tee /tmp/cloneityclone " "tr '[:lower:]' '[:upper:]'"
  42 #==END sample code==
  43
  44 # Author: Steven Baltakatei Sandoval
  45 # License: GPLv3+