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37 lines
735 B
37 lines
735 B
1 year ago
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#!/bin/dash
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help="""
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usage: timer [option] [args]
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options:
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-c SECONDS Count down from given amount of seconds
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-s Start stopwatch
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-h Display this message
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"""
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countdown() {
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start="$(( $(date '+%s') + $1))"
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while [ $start -ge $(date +%s) ]; do
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time="$(( $start - $(date +%s) ))"
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printf '%s\r' "$(date -u -d "@$time" +%H:%M:%S)"
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sleep 0.1
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done
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}
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stopwatch() {
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start=$(date +%s)
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while true; do
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time="$(( $(date +%s) - $start))"
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printf '%s\r' "$(date -u -d "@$time" +%H:%M:%S)"
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sleep 0.1
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done
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}
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while getopts "c:sh" arg; do
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case $arg in
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c) countdown $OPTARG;;
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s) stopwatch;;
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h) echo "$help";;
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esac
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done
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