unitproc/bktemp-setTimeZoneEV

   1 #!/bin/bash
   2
   3 # Desc: Set time zone environment variable TZ
   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 setTimeZoneEV(){
   9     # Desc: Set time zone environment variable TZ
  10     # Usage: setTimeZoneEV arg1
  11     # Input: arg1: 'date'-compatible timezone string (ex: "America/New_York")
  12     #        TZDIR env var (optional; default: "/usr/share/zoneinfo")
  13     # Output: exports TZ
  14     #         exit code 0 on success
  15     #         exit code 1 on incorrect number of arguments
  16     #         exit code 2 if unable to validate arg1
  17     # Depends: yell, die, try
  18     ARG1="$1"
  19     local tzDir returnState
  20     if ! [[ $# -eq 1 ]]; then
  21         yell "ERROR:Invalid argument count.";
  22         return 1;
  23     fi
  24
  25     # Read TZDIR env var if available
  26     if printenv TZDIR 1>/dev/null 2>&1; then
  27         tzDir="$(printenv TZDIR)";
  28     else
  29         tzDir="/usr/share/zoneinfo";
  30     fi
  31
  32     # Validate TZ string
  33     if ! [[ -f "$tzDir"/"$ARG1" ]]; then
  34         yell "ERROR:Invalid time zone argument.";
  35         return 2;
  36     else
  37     # Export ARG1 as TZ environment variable
  38         TZ="$ARG1" && export TZ && returnState="true";
  39     fi
  40
  41     # Determine function return code
  42     if [ "$returnState" = "true" ]; then
  43         return 0;
  44     fi
  45 } # Exports TZ environment variable
  46
  47 #==BEGIN sample code==
  48 date --iso-8601=seconds; echo "==============="; sleep 2
  49
  50 date --iso-8601=seconds
  51 cmd1="setTimeZoneEV America/New_York"
  52 echo "Running:$cmd1"; $cmd1; echo "Exit code:$?"
  53 date --iso-8601=seconds; echo "==============="; sleep 2
  54
  55 date --iso-8601=seconds
  56 cmd2="setTimeZoneEV Asia/Tokyo"
  57 echo "Running:$cmd2"; $cmd2; echo "Exit code:$?"
  58 date --iso-8601=seconds; echo "==============="; sleep 2
  59
  60 date --iso-8601=seconds
  61 cmd3="setTimeZoneEV";
  62 echo "Running:$cmd3"; $cmd3; echo "Exit code:$?"
  63 date --iso-8601=seconds; echo "==============="; sleep 2
  64
  65 date --iso-8601=seconds
  66 cmd4="setTimeZoneEV Pacific/Lemuria"
  67 echo "Running:$cmd4"; $cmd4; echo "Exit code:$?"
  68 date --iso-8601=seconds; echo "==============="; sleep 2
  69 #==END sample code==
  70
  71 # Author: Steven Baltakatei Sandoval
  72 # License: GPLv3+
  73
  74