> Linux Man Page: "tac"


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The Linux Documentation Project maintains an archive of snaphots of the (English language) core Linux manual pages that are maintained by Michael Kerrisk. Corrections and additions are welcome, but review the "Help Wanted" list, first.

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man page(1) manual page Table of Contents


tac - concatenate and print files in reverse


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

--help display this help and exit

output version information and exit


Written by Jay Lepreau and David MacKenzie.

Reporting Bugs

Report bugs to <>.


Copyright © 2007 Free Software Foundation, Inc. This is free software. You may redistribute copies of it under the terms of the GNU General Public License <>. There is NO WARRANTY, to the extent permitted by law.

See Also

The full documentation for tac is maintained as a Texinfo manual. If the info and tac programs are properly installed at your site, the command

info tac

should give you access to the complete manual.

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