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Linux grep: Search recursively within a file

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When searching for arbitrary keywords in the file, use the option "r" with the grep command to search including subdirectories.

grep -r search-string [dir | file]

Important here, directory and file patterns can not be used.

*.php

readme.*

This means that we can not use it.

Specify the full name of the directory name, file name, or specify an asterisk (*).

When specifying an asterisk, search all under the current directory.

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