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 string, --separator=string
-
Use
string
as the record separator.
-
--help
-
Print a usage message and exit with a status code indicating success.
-
--version
-
Print version information on standard output then exit.