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This article introduces the relevant knowledge of "the usage of the Linux basic command tac". Many people will encounter such a dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Tac

The lines in the specified file are displayed in reverse order. The scope of this command: RedHat, RHEL, Ubuntu, CentOS, SUSE, openSUSE, Fedora.

1. Grammar

Tac [options] file

2. List of options

Option

Description

-- version

Display command version information

-- help

Show help documentation

-b |-- before

Put the delimiter before the file record

-r |-- regex

Treat delimiters as normal characters

-s |-- separator=STRING

Replaces the newly created control character with the specified interval character

3. Examples

1) display in reverse order

[root@localhost weijie] # cat 1.c / / View the contents of the file

Hello world

I am david.

I love linux

Love code.

[root@localhost weijie] # tac 1.c / / reverse order display

Love code.

I love linux

I am david.

Hello world

2) put the delimiter in front of the file

[root@localhost weijie] # tac-b 1.c / / put the delimiter "carriage return" at the front of the file, resulting in two blank lines in front of the file, and the last line cannot be wrapped

Love code.

I love linux

I am david. Hello world, [root@localhost weijie]

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