whileで1秒毎にコマンドを実行する
while true; do date; sleep 1s; done
whileで回数を決めてコマンドを実行する
i=1; while [ $i -le 10 ]; do echo $i; i=$(expr $i + 1);done
watchで1秒毎にコマンドを実行する
watch -n 1 date
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