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How are the rev and tac commands used in Linux systems? Many novices are not very clear about this. In order to help you solve this problem, the following editor will explain it in detail. People with this need can come and learn. I hope you can gain something.

Rev

Rev displays the last character to the first character.

Parameter: none

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: let's take a look at the comparison of the cat, rev, and tac commands, which is very simple:

The code is as follows:

[root@localhost www] # cat test

1234

Abcd

The code is as follows:

[root@localhost www] # rev test

4321

Dcba

The code is as follows:

[root@localhost www] # tac test

Abcd

1234

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