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+.\"***************************************************************************
+.\" Copyright (c) 2008-2016,2017 Free Software Foundation, Inc. *
+.\" *
+.\" Permission is hereby granted, free of charge, to any person obtaining a *
+.\" copy of this software and associated documentation files (the *
+.\" "Software"), to deal in the Software without restriction, including *
+.\" without limitation the rights to use, copy, modify, merge, publish, *
+.\" distribute, distribute with modifications, sublicense, and/or sell *
+.\" copies of the Software, and to permit persons to whom the Software is *
+.\" furnished to do so, subject to the following conditions: *
+.\" *
+.\" The above copyright notice and this permission notice shall be included *
+.\" in all copies or substantial portions of the Software. *
+.\" *
+.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
+.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
+.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
+.\" IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
+.\" DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
+.\" OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
+.\" THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
+.\" *
+.\" Except as contained in this notice, the name(s) of the above copyright *
+.\" holders shall not be used in advertising or otherwise to promote the *
+.\" sale, use or other dealings in this Software without prior written *
+.\" authorization. *
+.\"***************************************************************************
+.\"
+.\" $Id: tabs.1,v 1.16 2017/11/18 23:56:00 tom Exp $
+.TH tabs 1 ""
+.ds n 5
+.ie \n(.g .ds `` \(lq
+.el .ds `` ``
+.ie \n(.g .ds '' \(rq
+.el .ds '' ''
+.de bP
+.ie n .IP \(bu 4
+.el .IP \(bu 2
+..
+.de NS
+.ie n .sp
+.el .sp .5
+.ie n .in +4
+.el .in +2
+.nf
+.ft C \" Courier
+..
+.de NE
+.fi
+.ft R
+.in -4
+..
+.SH NAME
+\fBtabs\fR \- set tabs on a terminal
+.SH SYNOPSIS
+\fBtabs\fR [\fIoptions\fR]] \fI[tabstop-list]\fR
+.SH DESCRIPTION
+.PP
+The \fBtabs\fP program clears and sets tab-stops on the terminal.
+This uses the terminfo \fIclear_all_tabs\fP and \fIset_tab\fP capabilities.
+If either is absent, \fBtabs\fP is unable to clear/set tab-stops.
+The terminal should be configured to use hard tabs, e.g.,
+.NS
+stty tab0
+.NE
+.PP
+Like \fBclear\fR(1), \fBtabs\fR writes to the standard output.
+You can redirect the standard output to a file (which prevents
+\fBtabs\fR from actually changing the tabstops),
+and later \fBcat\fP the file to the screen, setting tabstops at that point.
+.SH OPTIONS
+.SS General Options
+.TP 5
+.BI \-T "name"
+Tell \fBtabs\fP which terminal type to use.
+If this option is not given, \fBtabs\fP will use the \fB$TERM\fP
+environment variable.
+If that is not set, it will use the \fIansi+tabs\fP entry.
+.TP 5
+.B \-d
+The debugging option shows a ruler line, followed by two data lines.
+The first data line shows the expected tab-stops marked with asterisks.
+The second data line shows the actual tab-stops, marked with asterisks.
+.TP 5
+.B \-n
+This option tells \fBtabs\fP to check the options and run any debugging
+option, but not to modify the terminal settings.
+.TP
+\fB\-V\fR
+reports the version of ncurses which was used in this program, and exits.
+.PP
+The \fBtabs\fP program processes a single list of tab stops.
+The last option to be processed which defines a list is the one that
+determines the list to be processed.
+.SS Implicit Lists
+Use a single number as an option, e.g., \*(``\fB\-5\fP\*('' to set tabs at the given
+interval (in this case 1, 6, 11, 16, 21, etc.). Tabs are repeated up to
+the right margin of the screen.
+.PP
+Use \*(``\fB\-0\fP\*('' to clear all tabs.
+.PP
+Use \*(``\fB\-8\fP\*('' to set tabs to the standard interval.
+.SS Explicit Lists
+An explicit list can be defined after the options
+(this does not use a \*(``\-\*('').
+The values in the list must be in increasing numeric order,
+and greater than zero.
+They are separated by a comma or a blank, for example,
+.NS
+tabs 1,6,11,16,21
+.br
+tabs 1 6 11 16 21
+.NE
+.PP
+Use a \*(``+\*('' to treat a number as an increment relative to the previous value,
+e.g.,
+.NS
+tabs 1,+5,+5,+5,+5
+.NE
+.PP
+which is equivalent to the 1,6,11,16,21 example.
+.SS Predefined Tab-Stops
+X/Open defines several predefined lists of tab stops.
+.TP 5
+.B \-a
+Assembler, IBM S/370, first format
+.TP 5
+.B \-a2
+Assembler, IBM S/370, second format
+.TP 5
+.B \-c
+COBOL, normal format
+.TP 5
+.B \-c2
+COBOL compact format
+.TP 5
+.B \-c3
+COBOL compact format extended
+.TP 5
+.B \-f
+FORTRAN
+.TP 5
+.B \-p
+PL/I
+.TP 5
+.B \-s
+SNOBOL
+.TP 5
+.B \-u
+UNIVAC 1100 Assembler
+.SH PORTABILITY
+.PP
+IEEE Std 1003.1/The Open Group Base Specifications Issue 7 (POSIX.1-2008) describes
+a \fBtabs\fP utility. However
+.bP
+This standard describes a \fB+m\fP option, to set a terminal's left-margin.
+Very few of the entries in the terminal database provide this capability.
+.bP
+There is no counterpart in X/Open Curses Issue 7 for this utility,
+unlike \fBtput(1)\fP.
+.PP
+The \fB\-d\fP (debug) and \fB\-n\fP (no-op) options are extensions not provided
+by other implementations.
+.PP
+Documentation for other implementations states that there is a limit on the
+number of tab stops. While some terminals may not accept an arbitrary number
+of tab stops, this implementation will attempt to set tab stops up to the
+right margin of the screen, if the given list happens to be that long.
+.SH SEE ALSO
+\fBtset\fR(1),
+\fBinfocmp\fR(1),
+\fBncurses\fR(3NCURSES),
+\fBterminfo\fR(\*n).
+.PP
+This describes \fBncurses\fR
+version 6.1 (patch 20180317).