usr.bin/tabs/tabs.1

.\" $NetBSD: tabs.1,v 1.6 2014/03/18 18:20:45 riastradh Exp $
.\"
.\" Copyright (c) 2008 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Roy Marples.
.\"
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.\" modification, are permitted provided that the following conditions
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.Dd April 5, 2012
.Dt TABS 1
.Os
.Sh NAME
.Nm tabs
.Nd set terminal tabs
.Sh SYNOPSIS
.Nm
.Op Fl n Ns | Ns Fl a Ns | Ns Fl a2 Ns | Ns Fl c Ns | Ns Fl c2 \
Ns | Ns Fl c3 Ns | Ns Fl f Ns | Ns Fl p Ns | Ns Fl s Ns | Ns Fl u
.Op +m Ns Op n
.Op Fl T Ar type
.Nm
.Op Fl T Ar type
.Op + Ns Op n
.Ar n1 Ns Op , Ns Ar n2 , Ns Ar ...
.Sh DESCRIPTION
The
.Nm
utility displays a series of characters that first clears the hardware terminal
tab settings and then initializes the tab stops at the specified positions
and optionally adjusts the margin.
.Pp
The phrase "tab-stop position N" means that, from the start of a line of
output, tabbing to position N shall cause the next character output to be in
the (N+1)th column on that line.
.Pp
The following options are supported:
.Bl -tag -width Fl
.It Fl Ar n
Specifies repetitive tab stops separated by a uniform number of columns,
.Ar n ,
where
.Ar n
is a single digit decimal number.
The default usage of
.Nm
with no arguments is equivalent to
.Nm
.Fl 8 .
When
.Fl 0
is used, the tab stops are cleared and no new ones set.
.It Fl a
Assembler, applicable to some mainframes.
Equivalent to
.Nm
1,10,16,36,72 .
.It Fl a2
Assembler, applicable to some mainframes.
Equivalent to
.Nm
1,10,16,40,72
.It Fl c
.Tn COBOL ,
normal format.
Equivalent to
.Nm
1,8,12,16,20,55
.It Fl c2
.Tn COBOL ,
compact format (columns 1 to 6 omitted).
Equivalent to
.Nm
1,6,10,14,49
.It Fl c3
.Tn COBOL ,
compact format (columns 1 to 6 omitted), with more tabs than
.Fl c2 .
Equivalent to
.Nm
1,6,10,14,18,22,26,30,34,38,42,46,50,54,58,62,67
.It Fl f
.Tn FORTRAN .
Equivalent to
.Nm
1,7,11,15,19,23
.It Fl p
.Tn PL/1 .
Equivalent to
.Nm
1,5,9,13,17,21,25,29,33,37,41,45,49,53,57,61
.It Fl s
.Tn SNOBOL .
Equivalent to
.Nm
1,10,55
.It Fl T Ar type
Indicates the type of terminal.
.It Fl u
Assembler, applicable to some mainframes.
Equivalent to
.Nm
1,12,20,44
.El
.Sh ENVIRONMENT
The
.Ev COLUMNS
and
.Ev TERM
environment variables affect the execution of
.Nm
as described in
.Xr environ 7 .
.Pp
The
.Fl T
option overrides
.Ev TERM .
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 terminfo 5
.Sh STANDARDS
The
.Nm
utility conforms to
.St -p1003.1 .
.Sh HISTORY
A
.Nm
utility first appeared in PWB UNIX.
This implementation was introduced in
.Nx 6.0 .
.Sh AUTHORS
.An Roy Marples Aq Mt roy@NetBSD.org