Detailed Linux output file contents of Rev and TAC command to use

Rev

Rev Displays the last character displayed to the first character.

Cases:

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 [options] ... [File] ...

Each specified file is inverted by line and written to standard output.

If you do not specify a file, or if the file is "-", the data is read from standard input.

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

-B,--before add a separator flag before and after a row

-R,--regex the delimited flag as a regular expression to parse

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

--HELP displays this help information and exits

--version display version information and exit

Cases:

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