tac - concatenate and print files in reverse


tac [-br] [-s separator] [--before] [--regex] [--separator=separator] [--help] [--version] [file...]


This manual page documents the GNU version of tac. tac copies each given file, or the standard input if none are given or when a file name of `-' is encountered, to the standard output with the order of the records reversed. The records are separated by instances of a string, or a newline if none is given. By default, the separator string is attached to the end of the record that it follows in the file.


-b, --before
The separator is attached to the beginning of the record that it precedes in the file.
-r, --regex
The separator is a regular expression.
-s string, --separator=string
Use string as the record separator.
Print a usage message and exit with a status code indicating success.
Print version information on standard output then exit.