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Which one of the following command is used for searching for a pattern in one or more file(s)?

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Which one of the following command is used for searching for a pattern in one or more file(s)?

(a) cd

(b) cp

(c) paste

(d) grep

I have been asked this question in quiz.

The question is from grep command topic in section Filters using Regular Expressions of Unix

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Correct option is (d) grep

The best I can explain: UNIX has a special family of commands for handling search requirements, and the principal member of this family is the grep command. This command scans its input for a pattern and displays the lines containing the pattern, the line numbers or filenames containing the pattern.

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