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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 (C) 2006 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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