.\" Copyright (c) 2002 Tim J. Robbins.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" $FreeBSD: src/usr.bin/tabs/tabs.1,v 1.6 2002/11/26 17:33:36 ru Exp $
.\" $DragonFly: src/usr.bin/tabs/tabs.1,v 1.3 2007/07/30 22:11:33 swildner Exp $
.\"
.Dd June 19, 2004
.Dt TABS 1
.Os
.Sh NAME
.Nm tabs
.Nd set terminal tabs
.Sh SYNOPSIS
.Nm
.Op Fl Ar n | Fl a | a2 | c | c2 | c3 | f | p | s | u
.Op Cm +m Ns Op Ar n
.Op Fl T Ar type
.Nm
.Op Fl T Ar type
.Op Cm + Ns Op Ar n
.Ar n1 Ns Op Ns , Ns Ar n2 , Ns ...
.Sh DESCRIPTION
The
.Nm
utility displays a series of characters that clear the hardware terminal
tab settings then initialises tab stops at specified positions, and
optionally adjusts the margin.
.Pp
In the first synopsis form, the tab stops set depend on the command line
options used, and may be one of the predefined formats or at regular
intervals.
.Pp
In the second synopsis form, tab stops are set at positions
.Ar n1 , n2 ,
etc.
If a position is preceded by a
.Ql + ,
it is relative to the previous position set.
No more than 20 positions may be specified.
.Pp
If no tab stops are specified, the
.Dq standard
.Ux
tab width of 8 is used.
.Pp
The options are as follows:
.Bl -tag -width indent
.It Fl Ar n
Set a tab stop every
.Ar n
columns.
If
.Ar n
is 0, the tab stops are cleared but no new ones are set.
.It Fl a
Assembler format (columns 1, 10, 16, 36, 72).
.It Fl a2
Assembler format (columns 1, 10, 16, 40, 72).
.It Fl c
.Tn COBOL
normal format (columns 1, 8, 12, 16, 20, 55)
.It Fl c2
.Tn COBOL
compact format (columns 1, 6, 10, 14, 49)
.It Fl c3
.Tn COBOL
compact format (columns 1, 6, 10, 14, 18, 22, 26, 30, 34, 38, 42, 46,
50, 54, 58, 62, 67).
.It Fl f
.Tn FORTRAN
format (columns 1, 7, 11, 15, 19, 23).
.It Fl p
.Tn PL/1
format (columns 1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 45, 49, 53,
57, 61).
.It Fl s
.Tn SNOBOL
format (columns 1, 10, 55).
.It Fl u
Assembler format (columns 1, 12, 20, 44).
.It Xo
.Cm +m Ns Op Ar n ,
.Cm + Ns Op Ar n
.Xc
Set an
.Ar n
character left margin, or 10 if
.Ar n
is omitted.
.It Fl T Ar type
Output escape sequence for the terminal type
.Ar type .
.El
.Sh ENVIRONMENT
The
.Ev LANG , LC_ALL , LC_CTYPE
and
.Ev TERM
environment variables affect the execution of
.Nm
as described in
.Xr environ 7 .
.Pp
The
.Fl T
option overrides the setting of the
.Ev TERM
environment variable.
If neither
.Ev TERM
nor the
.Fl T
option are present,
.Nm
will fail.
.Sh EXIT STATUS
.Ex -std
.Sh SEE ALSO
.Xr expand 1 ,
.Xr stty 1 ,
.Xr tput 1 ,
.Xr unexpand 1 ,
.Xr termcap 5
.Sh STANDARDS
The
.Nm
utility conforms to
.St -p1003.1-2001 .
.Sh HISTORY
A
.Nm
utility appeared in PWB
.Ux .
.Sh BUGS
The current
.Xr termcap 5
database does not define the
.Ql ML
(set left soft margin) capability for any terminals.