freebsd-dev/usr.bin/expand/expand.1

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.\" Copyright (c) 1980, 1990, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
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.\" 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.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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
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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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.\" @(#)expand.1 8.1 (Berkeley) 6/9/93
1999-08-28 01:08:13 +00:00
.\" $FreeBSD$
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.\"
.Dd June 6, 2015
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.Dt EXPAND 1
.Os
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.Sh NAME
.Nm expand ,
.Nm unexpand
.Nd expand tabs to spaces, and vice versa
.Sh SYNOPSIS
.Nm
.Oo
.Fl t
.Sm off
.Ar tab1 , tab2 , ... , tabn
.Sm on
.Oc
.Op Ar
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.Nm unexpand
.Oo
.Fl a | t
.Sm off
.Ar tab1 , tab2 , ... , tabn
.Sm on
.Oc
.Op Ar
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.Sh DESCRIPTION
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The
.Nm
utility processes the named files or the standard input writing
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the standard output with tabs changed into blanks.
Backspace characters are preserved into the output and decrement
the column count for tab calculations.
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The
.Nm
utility is useful for pre-processing character files
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(before sorting, looking at specific columns, etc.) that
contain tabs.
.Pp
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The
.Nm unexpand
utility 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.
.Pp
The following options are available:
.Bl -tag -width indent
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.It Fl a
.Nm ( unexpand
only.)
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By default, only leading blanks and tabs
are reconverted to maximal strings of tabs.
If the
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.Fl a
option is given, then tabs are inserted whenever they would compress the
resultant file by replacing two or more characters.
.It Fl t Sm Ar tab1 , tab2 , ... , tabn Sm
Set tab stops at column positions
.Ar tab1 , tab2 , ... , tabn .
If only a single number is given, tab stops are set that number of
column positions apart instead of the default number of 8.
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.El
.Sh ENVIRONMENT
The
.Ev LANG , LC_ALL
and
.Ev LC_CTYPE
environment variables affect the execution of
.Nm
and
.Nm unexpand
as described in
.Xr environ 7 .
.Sh EXIT STATUS
.Ex -std expand unexpand
.Sh STANDARDS
The
.Nm
and
.Nm unexpand
utilities conform to
.St -p1003.1-2001 .
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.Sh HISTORY
The
.Nm
utility first appeared in
.Bx 1 .