NAME

tac − concatenate and print files in reverse

SYNOPSIS

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

DESCRIPTION

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. 

OPTIONS

−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, −−separator separator
Use separator as the record separator. 

−−help
Print a usage message and exit with a non-zero status.

−−version
Print version information on standard output then exit.