Linux "tac" Command Line Options and Examples
concatenate and print files in reverse

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.


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

Command Line Options:

attach the separator before instead of after
tac -b ...
interpret the separator as a regular expression
tac -r ...
use STRING as the separator instead of newline
tac -s ...
display this help and exit
tac --help ...
output version information and exitAUTHORWritten by Jay Lepreau and David MacKenzie.REPORTING BUGSGNU coreutils online help: <>Report tac translation bugs to <>COPYRIGHTCopyright © 2017 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 per‐mitted by law.
tac --version ...