But have you heard of the tac command in

Published: 14 March 2023
on channel: The Lazy SysAdmin
2,095
83

So you've overused and abused the cat command.

But have you heard of the tac command?

The tac command is like the cat command but it print the contents of a file in reverse order, with the last line of the file appearing first and the first line appearing last.

There are several reasons why you might use the tac command:

Reversing the order of a file: Sometimes you may want to see the contents of a file in reverse order, such as when you want to see the most recent entries in a log file first. The tac command is a quick and easy way to do this.

Reverse order printing of multiple files: If you have multiple files that you want to print in reverse order, the tac command can be used to do this quickly and easily.

Manipulating output from other commands: The tac command can be used to manipulate the output from other commands that produce output in a linear fashion. For example, if you use the ls command to list files, you can pipe the output to tac to reverse the order of the list.

Simplify code: Instead of writing a script or a program to reverse the order of a file or its contents, using tac is often simpler and more efficient.

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