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This article mainly explains "what does grep refer to in linux". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "what does grep mean in linux"?

In linux, grep is a system command, which is an acronym for "global regular expression print" global regular expression output and is used to find qualified strings in a file with the syntax "grep [- abcEFGhHilLnqrsvVwxy]".

The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

What is grep in linux

The grep command, which stands for global regular expression print (Global regular expression output), is one of the most powerful commands in linux systems. It searches one or more files for lines that match a given content and outputs the matching content.

The Linux grep command is used to find strings that match the criteria in the file.

The grep directive is used to find files that contain the specified template style. If the contents of a file are found to match the specified template style, the default grep directive will display the column containing the template style. If no file name is specified, or if the file name given is -, the grep instruction reads the data from the standard input device.

Grep syntax format:

Grep [parameters]

Common parameters:

-I: ignore case

-c: only the number of matching rows is output

-l: list only the file names that match, not the specific matching lines

-n: lists all matching lines and displays the line number

-h: do not display file names when querying multiple files

-v: displays all lines that do not contain matching text

-w: match the whole word

-x: match the entire line

-r: recursive search

Test directory, the contents of the files are all the same:

Example 1. Search string in file

Grep test test01.txt

Grep-I test test01.txt# ignores case

Grep-n test test01.txt#-n displays the line number

Grep-v 003 test01.txt#-v displays mismatched lines

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