Linux Vi replacement character command operation instance

Linux Vi replacement character command operation instance

In Linux development, it is often involved in processing the characters in the file, and replacement of the characters is also very frequent.

This document uses an actual file as an example to describe the commonly used vi replacement character commands in Linux, which provides reference for related development work.

 

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In this document, the operated file is testfile.txt, And the content is as follows:

Www.bkjia.com @ linux :~ /Bkjia/Test> cat TestFile.txt

12345678907890

ABCDABCDEFGHIJ

12345 ^ &*()()

98765432103210

Abcdabcdefghij123123

 

Enter the vi editing mode first, as shown below:

Www.bkjia.com @ linux :~ /Bkjia/Test> vi TestFile.txt

 

Run the following replace command in sequence (Note: Each Command must start with the colon ":"), and the replace part is marked in red.

1): n, $ s/str1/str2/

Replace the first str1 in each row from row n to row 2.

For example, run the following command in the vi editing mode of the testfile.txt file:

: 2, $ s/123/321/

The file content is changed:

12345678907890

ABCDABCDEFGHIJ

32145 ^ &*()()

98765432103210

Abcdabcdefghij321123

It can be seen that only the first "123" of the third row and the fifth row is changed to "321 ". "123" in the first line is not replaced because the command is executed from the second line.

 

2): n, $ s/str1/str2/g

Replace all str1 in each row from line n to the last row with str2.

Then run the following command:

: 2, $ s/3210/1234/g

The file content is changed:

12345678907890

ABCDABCDEFGHIJ

32145 ^ &*()()

98765412341234

Abcdabcdefghij321123

It can be seen that all "3210" starting from the second line is changed to "1234 ".

 

3): % s/str1/str2/

Replace the first str1 in each row with str2.

Then run the following command:

: % S/123/321/

The file content is changed:

32145678907890

ABCDABCDEFGHIJ

32145 ^ &*()()

98765432141234

Abcdabcdefghij321321

It can be seen that the first "123" in each row is changed to "321 ".

 

4): % s/str1/str2/g

Replace all str1 in each row with str2.

Then run the following command:

: % S/890/098/g

The file content is changed:

32145670987098

ABCDABCDEFGHIJ

32145 ^ &*()()

98765432141234

Abcdabcdefghij321321

It can be seen that all "890" in each row is changed to "098 ".

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