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while

간단한 셸 루프. 더 많은 정보: https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_09_04_09.

• stdin을 읽고 각 줄에 대해 작업 수행:

while read line; do echo "$line"; done

• 매초마다 명령을 영구적으로 실행:

while :; do 명령; sleep 1; done