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d8708eb1 SBS |
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 | |
00e89a7c SBS |
17 | # Depends: yell, printenv, bash 5 |
18 | # Tested on: Debian 10 | |
d8708eb1 SBS |
19 | ARG1="$1" |
20 | local tzDir returnState | |
21 | if ! [[ $# -eq 1 ]]; then | |
22 | yell "ERROR:Invalid argument count."; | |
23 | return 1; | |
24 | fi | |
25 | ||
26 | # Read TZDIR env var if available | |
27 | if printenv TZDIR 1>/dev/null 2>&1; then | |
28 | tzDir="$(printenv TZDIR)"; | |
29 | else | |
30 | tzDir="/usr/share/zoneinfo"; | |
31 | fi | |
32 | ||
33 | # Validate TZ string | |
34 | if ! [[ -f "$tzDir"/"$ARG1" ]]; then | |
35 | yell "ERROR:Invalid time zone argument."; | |
36 | return 2; | |
37 | else | |
38 | # Export ARG1 as TZ environment variable | |
39 | TZ="$ARG1" && export TZ && returnState="true"; | |
40 | fi | |
41 | ||
42 | # Determine function return code | |
43 | if [ "$returnState" = "true" ]; then | |
44 | return 0; | |
45 | fi | |
46 | } # Exports TZ environment variable | |
47 | ||
48 | #==BEGIN sample code== | |
49 | date --iso-8601=seconds; echo "==============="; sleep 2 | |
50 | ||
51 | date --iso-8601=seconds | |
52 | cmd1="setTimeZoneEV America/New_York" | |
53 | echo "Running:$cmd1"; $cmd1; echo "Exit code:$?" | |
54 | date --iso-8601=seconds; echo "==============="; sleep 2 | |
55 | ||
56 | date --iso-8601=seconds | |
57 | cmd2="setTimeZoneEV Asia/Tokyo" | |
58 | echo "Running:$cmd2"; $cmd2; echo "Exit code:$?" | |
59 | date --iso-8601=seconds; echo "==============="; sleep 2 | |
60 | ||
61 | date --iso-8601=seconds | |
62 | cmd3="setTimeZoneEV"; | |
63 | echo "Running:$cmd3"; $cmd3; echo "Exit code:$?" | |
64 | date --iso-8601=seconds; echo "==============="; sleep 2 | |
65 | ||
66 | date --iso-8601=seconds | |
67 | cmd4="setTimeZoneEV Pacific/Lemuria" | |
68 | echo "Running:$cmd4"; $cmd4; echo "Exit code:$?" | |
69 | date --iso-8601=seconds; echo "==============="; sleep 2 | |
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70 | |
71 | try setTimeZoneEV Atlantic/Atlantis | |
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72 | #==END sample code== |
73 | ||
74 | # Author: Steven Baltakatei Sandoval | |
75 | # License: GPLv3+ | |
76 | ||
77 |