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.\" SPDX-License-Identifier: 0BSD
.\"
.TH "TAC" "1" "June 7, 2021" "voreutils 6853b78" "General Commands Manual"
.nh
.if n .ad l
.SH "NAME"
\fBtac\fR
\- concatenate reversed files
.SH "SYNOPSIS"
.HP 4n
\fBtac\fR
[\fB\-rb\fR]
[\fB\-s\fR\ \fIeparator\fR]
[\fIfile\fR]\[u2026]
.SH "DESCRIPTION"
Read each
\fIfile\fR (or standard input if \(lq-\(rq),
split it on the separator expression, matching from the end, and print it back out, starting with the final match.
\fIfile\fR defaults to \(lq-\(rq.
.SH "OPTIONS"
.TP 21n
\fB\-s\fR, \fB\--separator\fR=\fIsep\fR
Separate with
\fIsep\fR
instead of a single newline.
An empty separator matches nothing
(and the invocation is equivalent to \fBcat\fR).
.PD 0
.TP 21n
\fB\-r\fR, \fB\--regex\fR
Treat separator as regular expression.
An empty separator is refused.
.TP 21n
\fB\-b\fR, \fB\--before\fR
Print separator before its line.