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TAC(1) User Commands TAC(1)

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
display this help and exit
output version information and exit

Written by Jay Lepreau and David MacKenzie.

GNU coreutils online help: <>
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Copyright © 2019 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.


Full documentation <>
or available locally via: info '(coreutils) tac invocation'

March 2019 GNU coreutils 8.31