Uncommon
Grep
Command-line utility for text search
Grep
grep is a command-line utility for searching text for lines that match a regular expression. Its name comes from the ed command g/re/p (global, regular expression, print), which has the same effect. grep was originally developed for the Unix operating system, and is commonly available on Unix-like and some other systems such as OS-9. The shell command that runs the utility has the same name: grep.
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