Windows Grep is a tool for searching files for text strings that you specify. Although Windows and many other programs have file searching capabilities built-in, none can match the power and versatility of Windows Grep.
What does ‘grep’ mean?
The Wiki says
grep is a command line utility originally written for use with the Unix operating system.
The name comes from a command in the Unix text editor ed that takes the form:
This means “search globally for matches to the regular expression re, and print lines where they are found”.
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