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utility_scripts/src/stopwatch.sh

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#!/bin/sh
# Simple stopwatch script that simply counts the elapsed time in seconds.
start=$(date +%s)
stty -echo # hide keyboard input
while [ true ]
do
time="$(($(date +%s) - $start))"
printf '%s\r' "$(date -u -d "@$time" +%H:%M:%S)"
sleep 1s
done