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並前往https://riptutorial.com/bash/example/8802/feed-a-while-loop-with-the-output-of-a-command

Bash Tutorial => Feed a while loop with the output of a ...

This feeds a while loop with the output of a grep command: while IFS=":" read -r user _ do # "$user" holds the username in /etc/passwd done < <(grep "hello" ...

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