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This article will explain in detail how to use the sed command to replace strings under Linux. The editor thinks it is very practical, so I share it with you for reference. I hope you can get something after reading this article.

The sed command replaces the string of the specified file and outputs it according to the specified format.

To replace the string, we need to use the following format.

$sed s / replaced target string / replaced string / file name

Below we replace the string "sample.txt" written as "appleorangemelon".

$sed s/orange/ORANGE/ sample.txt

The execution result is

AppleORANGEmelon

Replace and output the string.

In addition, as shown below, you can get the same result by connecting the sed command with "|" after the cat command.

$cat sample.txt | sed s/apple/APPLE/

Note that the sed command only replaces the string and outputs it, but does not overwrite the contents of the actual file

If you want to save the replacement in text, use redirect >.

Options used by the sed command

The command option description-e is replaced with the specified script-f file to add the contents of the script file described in the specified file-r uses extended regular expressions

Use of the sed command

Replace all lines

In the format described earlier, only the first matching string is replaced, even if there is a string in one line that matches multiple replacement object strings.

Therefore, to replace all matching strings:

$sed-e s/apple/APPLE/g sample.txt

The execution result is

APPLEorangemelonAPPLE

Replace the beginning and end of a line

$sed-e "s / ^ apple / APPLE/" sample.txt$ sed-e "s/apple\ $/ APPLE/" sample.txt

If you want to replace multiple substrings, you can specify multiple scripts.

$sed-e "s/apple/APPLE/"-e "s/orange/ORANGE/" sample.txt

Delete Row

Specify "d" to delete the specified row. For example, to delete the second line is "2d".

$sed-e '2d' sample.txt

In addition, you can delete multiple lines, as shown below: delete lines 1 to 3.

$sed-e '1jade 3d' sample2.txt about the method of replacing strings with sed commands under Linux is shared here. I hope the above content can be helpful to you and learn more knowledge. If you think the article is good, you can share it for more people to see.

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