What does the Linux grep command do? how to use?

When performing Linux system maintenance, if you want to quickly search for what you need in the text, the grep command is a very good choice. It is mainly used to find files that meet the conditions. Strings, thereby saving time and improving work efficiency. So how to use the grep command in Linux system? Let’s take a look at the detailed introduction.

　The Linux grep command is used to find strings that meet the conditions in the file.

The grep command is used to search for file contents containing the specified style and display the lines containing the style. If no filename is specified, grep will read data from standard input. grep is a powerful text search tool that helps users quickly locate key information.

grammar

　grep
[-abcEFGhHilLnqrsvVwxy][-A ][-B ][-C ][-d ] [-e

　Parameters

　-a or –text: Do not ignore binary data.

　-A or –after-context= : In addition to displaying the column that conforms to the template style, the content after the line is also displayed.

　-b or –byte-offset: Before displaying the line that matches the style, mark the number of the first character of the line.

　-B or –before-context= : In addition to displaying the line that matches the style, the content before the line is also displayed.

　-c or –count: Count the number of columns that match the style.

　-C or –context= or - : In addition to displaying the line that matches the style, it also displays the content before and after the line. .

　-d or –directories= : This parameter must be used when specifying a directory rather than a file to be searched, otherwise the grep command will report information and stop the action.

　-e

　-E or –extended-regexp: Use extended regular expression style.

　-f or –file= : Specify a rule file whose content contains one or more rule styles, allowing grep to find file contents that meet the rule conditions. The format is one per line. Regular style.

　-F or –fixed-regexp: Treat styles as a list of fixed strings.

　-G or –basic-regexp: Use the style as a normal representation.

　-h or –no-filename: Do not indicate the file name to which the line belongs before displaying the line that matches the style.

　-H or –with-filename: Before displaying the line that matches the style, indicates the file name to which the line belongs.

　………………

There are many parameters, so I won’t explain them one by one!

The above is the detailed content of What does the Linux grep command do? how to use?. For more information, please follow other related articles on the PHP Chinese website!