Moderate

Which of the following is not a filter command ?

Correct answer: D. cat

  • A. sort
  • B. wc
  • C. grep
  • D. cat

Explanation

A filter reads standard input, transforms or selects data, and writes standard output; `sort`, `wc`, and `grep` are classic filters. `cat` primarily concatenates and displays files, so it is the expected non-filter choice here.

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