tac(1) — Linux manual page

TAC(1)                        User Commands                        TAC(1)

NAME         top

       tac - concatenate and print files in reverse

SYNOPSIS         top

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

DESCRIPTION         top

       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.

       ]8;;https://www.gnu.org/software/coreutils/manual/coreutils.html#tac-b\-b, --before]8;;\
              attach the separator before instead of after

       ]8;;https://www.gnu.org/software/coreutils/manual/coreutils.html#tac-r\-r, --regex]8;;\
              interpret the separator as a regular expression

       ]8;;https://www.gnu.org/software/coreutils/manual/coreutils.html#tac-s\-s, --separator=STRING]8;;\
              use STRING as the separator instead of newline

       ]8;;https://www.gnu.org/software/coreutils/tac#tac--help\--help]8;;\ display this help and exit

       ]8;;https://www.gnu.org/software/coreutils/tac#tac--version\--version]8;;\
              output version information and exit

       Non-seekable input is buffered to $TMPDIR, defaulting to /tmp.

AUTHOR         top

       Written by Jay Lepreau and David MacKenzie.

REPORTING BUGS         top

       Report bugs to: bug-coreutils@gnu.org
       GNU coreutils home page: <https://www.gnu.org/software/coreutils/>
       General help using GNU software: <https://www.gnu.org/gethelp/>
       Report any translation bugs to
       <https://translationproject.org/team/>

COPYRIGHT         top

       Copyright © 2026 Free Software Foundation, Inc.  License GPLv3+:
       GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.
       There is NO WARRANTY, to the extent permitted by law.

SEE ALSO         top

       cat(1), rev(1)

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

COLOPHON         top

       This page is part of the coreutils (basic file, shell and text
       manipulation utilities) project.  Information about the project
       can be found at ⟨http://www.gnu.org/software/coreutils/⟩.  If you
       have a bug report for this manual page, see
       ⟨http://www.gnu.org/software/coreutils/⟩.  This page was obtained
       from the tarball coreutils-9.11.tar.xz fetched from
       ⟨http://ftp.gnu.org/gnu/coreutils/⟩ on 2026-05-24.  If you
       discover any rendering problems in this HTML version of the page,
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       page, or you have corrections or improvements to the information
       in this COLOPHON (which is not part of the original manual page),
       send a mail to man-pages@man7.org

GNU coreutils 9.11              April 2026                         TAC(1)

Pages that refer to this page: cat(1),  rev(1)

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