#!/bin/bash
# Desc: Displays `uptime` information but with ISO-8601 time period
# string.
yell() { echo "$0: $*" >&2; } # Yell, Die, Try Three-Fingered Claw technique; # Ref/Attrib: https://stackoverflow.com/a/25515370
die() { yell "$*"; exit 111; }
try() { "$@" || die "cannot $*"; }
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: 1.0.5
# 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 -ge 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 )
uptimeIso8601() {
# Desc: Get system uptime with ISO_8601-formatted time period
# Usage: uptimeIso8601
# Output: A string similar to `uptime` but with date and uptime
# time period replaced with a period/endtime ISO-8601-formatted
# string.
# ex: `P3DT23H36M46S/2021-03-28T14:47:48+0000, 5 users, load average: 0.09, 0.10, 0.13`
# Note: No arguments used.
# Depends: timeDuration() v1.0.5, uptime
# Version: 0.0.1
# Ref/Attrib: get uptime in seconds https://leo.leung.xyz/wiki/Linux_Uptime_in_Seconds
sysUptime=$(</proc/uptime);
sysUptime=${sysUptime%%.*}; #
sysUptimeIso="$(timeDuration $sysUptime 4)";
timeNow="$(date +%Y-%m-%dT%H:%M:%S%z)";
users_load="$(uptime | cut -d',' -f3-)";
output="$sysUptimeIso"/"$timeNow","$users_load ";
echo "$output";
} # Get uptime with ISO-8601 time period
main() {
uptimeIso8601;
}
main;
# Author: Steven Baltakatei Sandoval
# License: GPLv3+