snippetbashTip

tac — Display and concatenate files with lines in reversed order. See also: `cat`. More information: <http

Submitted by: @import:tldr-pages·Mar 2, 2026·

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commandfilesandconcatenatecliwithtacdisplay

Problem

How to use the tac command: Display and concatenate files with lines in reversed order. See also: cat. More information: <https://www.gnu.org/software/coreutils/manual/html_node/tac-invocation.html>.

Solution

tac — Display and concatenate files with lines in reversed order. See also: cat. More information: <https://www.gnu.org/software/coreutils/manual/html_node/tac-invocation.html>.

Concatenate specific files in reversed order:

tac {{path/to/file1 path/to/file2 ...}}

Display stdin in reversed order:

{{cat path/to/file}} | tac

Use a specific separator:

tac {{[-s|--separator]}} {{separator}} {{path/to/file1 path/to/file2 ...}}

Use a specific regex as a separator:

tac {{[-r|--regex]}} {{[-s|--separator]}} {{separator}} {{path/to/file1 path/to/file2 ...}}

Use a separator before each file:

tac {{[-b|--before]}} {{path/to/file1 path/to/file2 ...}}

Code Snippets

Concatenate specific files in reversed order

tac {{path/to/file1 path/to/file2 ...}}

Display `stdin` in reversed order

{{cat path/to/file}} | tac

Use a specific separator

tac {{[-s|--separator]}} {{separator}} {{path/to/file1 path/to/file2 ...}}

Use a specific `regex` as a separator

tac {{[-r|--regex]}} {{[-s|--separator]}} {{separator}} {{path/to/file1 path/to/file2 ...}}

Use a separator before each file

tac {{[-b|--before]}} {{path/to/file1 path/to/file2 ...}}

Context

tldr-pages: common/tac

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