24 lines
628 B
Bash
Executable file
24 lines
628 B
Bash
Executable file
#!/usr/bin/env bash
|
|
|
|
function usage {
|
|
echo "countdown - exit after a certain amount of time has passed"
|
|
echo " Usage:"
|
|
echo " countdown <SECONDS> && command..."
|
|
echo
|
|
echo " Examples:"
|
|
echo ' countdown 120 && echo "Two minutes has elapsed!"'
|
|
}
|
|
|
|
[[ $# -lt 1 ]] && { printf "error: no SECONDS argument provided\n" >&2; usage; exit 1; }
|
|
|
|
d=$(($(date +%s) + $1));
|
|
printf 'Started at %s\n' "$(date)"
|
|
|
|
while [[ "$d" -ge "$(date +%s)" ]]; do
|
|
_dt=$((d - $(date +%s)))
|
|
days=$((_dt / 86400))
|
|
printf "\r%sd %s " "$days" "$(date -u --date @$((_dt)) +%H:%M:%S)";
|
|
sleep 0.1
|
|
done
|
|
|
|
printf "\rCountdown finished %s\n" "$(date)"
|