1997-10-18 18:45:55 +04:00
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.\" $NetBSD: expand.1,v 1.4 1997/10/18 14:45:55 lukem Exp $
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1995-09-02 09:57:23 +04:00
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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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1993-03-21 12:45:37 +03:00
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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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. 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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1995-09-02 09:57:23 +04:00
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.\" @(#)expand.1 8.1 (Berkeley) 6/9/93
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.\"
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.Dd June 9, 1993
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.Dt EXPAND 1
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.Os BSD 4
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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
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.Op Fl Ns Ar tabstop
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.Op Fl Ns Ar tab1,tab2,...,tabn
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.Ar
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.Nm unexpand
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.Op Fl a
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.Ar
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.Sh DESCRIPTION
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.Nm
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processes the named files or the standard input writing
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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
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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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If a single
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.Ar tabstop
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argument is given, then tabs are set
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.Ar tabstop
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spaces apart instead of the default 8.
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If multiple tabstops are given then the tabs are set at those
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specific columns.
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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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Option (with
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.Nm unexpand
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only):
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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. If the
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.Fl a
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option is given, then tabs are inserted whenever they would compress the
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resultant file by replacing two or more characters.
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.El
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Bx 3.0 .
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