.\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.50.1.
.TH TAC "1" "April 2026" "GNU coreutils 9.11" "User Commands"
.SH NAME
tac \- concatenate and print files in reverse
.SH SYNOPSIS
.B tac
[\fI\,OPTION\/\fR]... [\fI\,FILE\/\fR]...
.SH DESCRIPTION
.\" Add any additional description here
.PP
Write each FILE to standard output, last line first.
.PP
With no FILE, or when FILE is \-, read standard input.
.PP
Mandatory arguments to long options are mandatory for short options too.
.TP
\X'tty: link https://www.gnu.org/software/coreutils/manual/coreutils.html#tac-b'\fB\-b, \-\-before\fP\X'tty: link'
attach the separator before instead of after
.TP
\X'tty: link https://www.gnu.org/software/coreutils/manual/coreutils.html#tac-r'\fB\-r, \-\-regex\fP\X'tty: link'
interpret the separator as a regular expression
.TP
\X'tty: link https://www.gnu.org/software/coreutils/manual/coreutils.html#tac-s'\fB\-s, \-\-separator=\,STRING\fP\X'tty: link'\/\fR
use STRING as the separator instead of newline
.TP
\X'tty: link https://www.gnu.org/software/coreutils/tac#tac--help'\fB\-\-help\fP\X'tty: link'
display this help and exit
.TP
\X'tty: link https://www.gnu.org/software/coreutils/tac#tac--version'\fB\-\-version\fP\X'tty: link'
output version information and exit
.PP
Non\-seekable input is buffered to $TMPDIR, defaulting to \fI\,/tmp\/\fP.
.SH AUTHOR
Written by Jay Lepreau and David MacKenzie.
.SH "REPORTING BUGS"
Report bugs to: bug\-coreutils@gnu.org
.br
GNU coreutils home page: <https://www.gnu.org/software/coreutils/>
.br
General help using GNU software: <https://www.gnu.org/gethelp/>
.br
Report any translation bugs to <https://translationproject.org/team/>
.SH COPYRIGHT
Copyright \(co 2026 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
.br
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
.SH "SEE ALSO"
\fBcat\fP(1), \fBrev\fP(1)
.PP
.br
Full documentation <https://www.gnu.org/software/coreutils/tac>
.br
or available locally via: info \(aq(coreutils) tac invocation\(aq