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04daaba997
we don;t support next to the posix compat blurb, in order to make things a bit clearer; this also makes the text more concise; ok millert schwarze sobrado
139 lines
3.9 KiB
Groff
139 lines
3.9 KiB
Groff
.\" $OpenBSD: expand.1,v 1.20 2014/03/17 21:48:51 jmc Exp $
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.\" $NetBSD: expand.1,v 1.3 1995/09/02 06:19:45 jtc Exp $
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.\"
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.\" Copyright (c) 1980, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)expand.1 8.1 (Berkeley) 6/9/93
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.\"
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.Dd $Mdocdate: March 17 2014 $
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.Dt EXPAND 1
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.Os
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.Sh NAME
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.Nm expand ,
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.Nm unexpand
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.Nd expand tabs to spaces, and vice versa
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.Sh SYNOPSIS
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.Nm expand
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.Op Fl t Ar tablist
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.Op Ar
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.Nm unexpand
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.Op Fl a
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.Op Ar
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.Sh DESCRIPTION
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.Nm expand
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processes the named files or the standard input,
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writing the standard output with tabs changed into blanks.
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Backspace characters are preserved into the output and decrement
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the column count for tab calculations.
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.Nm expand
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is useful for pre-processing character files
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(before sorting, looking at specific columns, etc.) that
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contain tabs.
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.Pp
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.Nm unexpand
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puts tabs back into the data from the standard input or the named
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files and writes the result on the standard output.
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.Pp
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The options are as follows:
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.Bl -tag -width flag
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.It Fl a
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By default, only leading blanks and tabs
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are reconverted to maximal strings of tabs.
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If the
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.Fl a
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option is given, tabs are inserted whenever they would compress the
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resultant file by replacing two or more characters.
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.It Fl t Ar tablist
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If the argument to
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.Fl t ,
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.Ar tablist ,
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consists of a single numerical argument, tabs are set
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.Ar tablist
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spaces apart instead of the default 8.
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If multiple
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.Fl t
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options are given, then the tabs are set at those
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specific columns.
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.Pp
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Otherwise the argument to
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.Fl t
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may consist of a list
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of two or more positive decimal integers,
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separated by commas or single blank characters,
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in ascending order:
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in the event of having to process a
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.Aq tab
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at a position beyond the last of those specified in a multiple
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.Fl t
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list,
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the
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.Aq tab
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is replaced by a single
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.Aq space
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character.
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.Pp
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This implementation of
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.Nm
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additionally allows
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.Ar tablist
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to be specified without using the
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.Fl t
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flag, by prefixing
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.Ar tablist
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with a dash
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.Pq - .
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.El
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.Sh EXIT STATUS
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.Ex -std expand unexpand
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.Sh SEE ALSO
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.Xr fold 1
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.Sh STANDARDS
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The
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.Nm
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and
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.Nm unexpand
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utilities are compliant with the
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.St -p1003.1-2008
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specification,
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except that this implementation does not support a
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.Fl t
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flag for
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.Nm unexpand .
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.Pp
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The ability to specify tabstops without the
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.Fl t
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flag is not specified by
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.St -p1003.1-2008 ,
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though it states it
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.Dq may be present in some implementations .
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.Sh HISTORY
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The
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.Nm expand
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utility first appeared in
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.Bx 1 .
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