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Commit | Line | Data |
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1 | #!/bin/bash | |
2 | # Desc: Template to display date | |
3 | ||
4 | yell() { echo "$0: $*" >&2; } #o Yell, Die, Try Three-Fingered Claw technique | |
5 | die() { yell "$*"; exit 111; } #o Ref/Attrib: https://stackoverflow.com/a/25515370 | |
6 | try() { "$@" || die "cannot $*"; } #o | |
7 | dateShort(){ | |
8 | # Desc: Date without separators (YYYYmmdd) | |
9 | # Usage: dateShort ([str date]) | |
10 | # Version: 1.1.2 | |
11 | # Input: arg1: 'date'-parsable timestamp string (optional) | |
12 | # Output: stdout: date (ISO-8601, no separators) | |
13 | # Depends: bash 5.0.3, date 8.30, yell() | |
14 | local argTime timeCurrent timeInput dateCurrentShort | |
15 | ||
16 | argTime="$1"; | |
17 | # Get Current Time | |
18 | timeCurrent="$(date --iso-8601=seconds)" ; # Produce `date`-parsable current timestamp with resolution of 1 second. | |
19 | # Decide to parse current or supplied date | |
20 | ## Check if time argument empty | |
21 | if [[ -z "$argTime" ]]; then | |
22 | ## T: Time argument empty, use current time | |
23 | timeInput="$timeCurrent"; | |
24 | else | |
25 | ## F: Time argument exists, validate time | |
26 | if date --date="$argTime" 1>/dev/null 2>&1; then | |
27 | ### T: Time argument is valid; use it | |
28 | timeInput="$argTime"; | |
29 | else | |
30 | ### F: Time argument not valid; exit | |
31 | yell "ERROR:Invalid time argument supplied. Exiting."; exit 1; | |
32 | fi; | |
33 | fi; | |
34 | # Construct and deliver separator-les date string | |
35 | dateCurrentShort="$(date -d "$timeInput" +%Y%m%d)"; # Produce separator-less current date with resolution 1 day. | |
36 | echo "$dateCurrentShort"; | |
37 | } # Get YYYYmmdd | |
38 | ||
39 | #==BEGIN sample code== | |
40 | echo "The current day is :$(dateShort)"; | |
41 | echo "Contact lost with STS-107 on:$(dateShort "2003-02-01T08:59:15-05:00")"; | |
42 | echo "Bitcoin started on :$(dateShort "@1231006505")"; | |
43 | #==END sample code== | |
44 | ||
45 | # Author: Steven Baltakatei Sandoval | |
46 | # License: GPLv3+ |