How to use sed command and awk command in linux

This article mainly introduces the use of sed command and awk command in Linux. It has certain reference value. Friends in need can refer to it. I hope it can help everyone.

1. sed command: Without redirection, the content in the source file will not be actually modified

Query statement

①sed -n '/sbin/p' passwd

means to query all the lines with sbin characters in the passwd file and print them out. The two /s represent regular expressions. -n and /p are the parameters of the command. Need to be used in combination

②sed -n 'xp' passwd

x is a number, which means printing out the data of line x in the passwd file

New Add statement

①sed '1a This is the content added after the first line' passwd

where a means to add content, and the number 1 means which line it is, above The meaning of the statement means to add content after the first line of the passwd file

②sed '1i This is the data inserted before the first line' passwd

where i means insert Data, the number 1 indicates which row, the above statement means to insert text content before the first row

3, sed '1c hello world' passwd

c Indicates replacement. The statement means to replace the first line in the password file with hello world

4, sed 's/false/true/' passwd

means to replace Replace the false characters in the passwd file with true characters

Delete the statement

①sed '/postgres/d' passwd

Delete the regular expression in the passwd file Formula to match all lines of postgres

2, sed '2d' passwd

Delete the second line in the passwd file

## Summary

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