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This article mainly explains "the use of rev and tac commands in Linux". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "the use of rev and tac commands in Linux".

Rev

Rev displays the last character to the first character.

Example:

The code is as follows:

[root@localhost www] # cat test

1234

Abcd

[root@localhost www] # rev test

4321

Dcba

[root@localhost www] # tac test

Abcd

1234

Tac

Usage: tac [option]. [file].

Reverses each specified file by line and writes to standard output.

If no file is specified, or if the file is "-", the data is read from standard input.

The parameters that must be used for long options are also required for short options.

-b,-- before adds a separation mark before the line instead of at the end of the line

-r,-- regex parses the delimiter as a regular expression

-s,-- the separator= string uses the specified string instead of a newline as a separator

-- help displays this help and exits

-- version displays version information and exits

Example:

The code is as follows:

[root@localhost www] # cat test

1234

Abcd

[root@localhost www] # rev test

4321

Dcba

[root@localhost www] # tac test

Abcd

1234

Thank you for reading, the above is the content of "the use of rev and tac commands in Linux". After the study of this article, I believe you have a deeper understanding of the use of rev and tac commands in Linux, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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