tac — concatenate and print files in reverse

Examples (TL;DR)


tac [OPTION]... [FILE]...


Write each FILE to standard output, last line first.

With no FILE, or when FILE is -, read standard input.

Mandatory arguments to long options are mandatory for short options too.

-b, --before

attach the separator before instead of after

-r, --regex

interpret the separator as a regular expression

-s, --separator=STRING

use STRING as the separator instead of newline


display this help and exit


output version information and exit


Written by Jay Lepreau and David MacKenzie.

Reporting Bugs

GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
Report any translation bugs to <https://translationproject.org/team/>

See Also


Full documentation <https://www.gnu.org/software/coreutils/tac>
or available locally via: info '(coreutils) tac invocation'

Referenced By

cat(1), rev(1).

October 2019 GNU coreutils 8.31