Multiple choice technology operating systems

Which of the following commands is not a filter?

  1. pg

  2. man

  3. cat

  4. head
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Filter commands in Unix/Linux read from standard input and write to standard output, making them suitable for use in pipelines. Commands like cat, head, pg (pager), grep, and sed are filters. The man command displays manual pages and does not read from stdin or produce output meant for piping - it's an information display utility, not a filter.

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