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

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.\" Copyright (c) 1980, 1990, 1993
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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 October 13, 2006
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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
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command appeared in
.Bx 3.0 .