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.
arguments to long options are mandatory for short options
attach the separator before instead of after
interpret the separator as a regular expression
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.
Report tac bugs
to bug−coreutils [AT] gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
Report tac translation bugs to <http://translationproject.org/team/>
© 2010 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.
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 coreutils 'tac invocation'
should give you access to the complete manual.