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fdf917e1 SBS |
1 | #!/bin/bash |
2 | ||
3 | # Date: 2020-02-13T23:14Z; baltakatei> | |
4 | ||
5 | # Description: This script outputs days until the next time zone | |
6 | # discontinuity using 'zdump' and 'date'. | |
7 | ||
8 | #=================ADJUST ME======================= | |
9 | SCRIPT_TZ="America/Los_Angeles" # Timezone to check for discontinuities | |
10 | #================================================= | |
11 | ||
12 | echoerr() { | |
13 | echo "$@" 1>&2; | |
14 | } | |
15 | ||
16 | # Declare variables | |
17 | declare -a datesDiscontArray #array | |
18 | ||
19 | SCRIPT_YEAR=$(date +%Y) | |
20 | SCRIPT_YEAR_NEXT=$(( $(date +%Y) + 1)) | |
21 | SCRIPT_RUN_DATE_SECONDS=$(date +%s) | |
22 | ||
23 | # Save zdump output for SCRIPT_YEAR (for how multiline data saved in variable, see https://stackoverflow.com/a/613580 ) | |
24 | datesDiscont="$(zdump -c $SCRIPT_YEAR_NEXT -v $SCRIPT_TZ | grep $SCRIPT_YEAR | awk '{ print $2 " " $3 " " $4 " " $5 " " $6 " " $7 }'; echo)" | |
25 | if [ -z "$datesDiscont" ]; then | |
26 | echo "No time discontinuity this year." | |
27 | exit 1 | |
28 | fi | |
29 | ||
30 | ###echoerr "datesDiscont:--""$datesDiscont""--" | |
31 | ||
32 | # Count lines in datesDiscont (for counting lines in a variable, see https://stackoverflow.com/a/6314682 ) | |
33 | #datesDiscontLineCount=$(echo "$datesDiscont" | wc -l) | |
34 | ||
35 | # Convert datesDiscont into array (for how to process each line in a multiline variable, see https://superuser.com/a/284226 ) | |
36 | while IFS= read -r line; do | |
37 | #echo "$line" | |
38 | #datesDiscontArray+="$line" | |
39 | datesDiscontArray+=($(date --date="$line" +%s)) | |
40 | #echo ${datesDiscontArray[-1]} | |
41 | done <<< "$datesDiscont" | |
42 | #echoerr ${datesDiscontArray[@]} | |
43 | ||
44 | # Sort datesDiscontArray (see https://stackoverflow.com/a/11789688 ) | |
45 | IFS=$'\n' datesDiscontArray=($(sort <<<"${datesDiscontArray[*]}")) | |
46 | unset IFS | |
47 | ||
48 | # Get earliest date in datesDiscontArray that isn't in the past. | |
49 | for discontinuityDate in "${datesDiscontArray[@]}"; do | |
50 | ###echoerr "Discontinuity date (seconds):"$discontinuityDate | |
51 | ###echoerr "SCRIPT_RUN_DATE_SECONDS :"$SCRIPT_RUN_DATE_SECONDS | |
52 | if [ $discontinuityDate -gt $SCRIPT_RUN_DATE_SECONDS ]; then | |
53 | ###echoerr "DEBUG:Date in future." | |
54 | nextDiscontDate="$discontinuityDate" | |
55 | break | |
56 | fi | |
57 | done | |
58 | ||
59 | echo $(( ( $nextDiscontDate - $SCRIPT_RUN_DATE_SECONDS )/86400 ))" days" # Days until next discontinuity date |