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NAME
tac - concatenate and print files in reverse
SYNOPSIS
tac [-br] [-s separator] [--before] [--regex] [--separator=separator]
[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.
The long-named options can be introduced with `+' as well as `--', for
compatibility with previous releases. Eventually support for `+' will be
removed, because it is incompatible with the POSIX.2 standard.