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\"      @(#)expand.1    8.1 (Berkeley) 6/9/93
\"
Dd December 20, 2008
Dt EXPAND 1
Os
Sh NAME
Nm expand ,
Nm unexpand
Nd expand tabs to spaces, and vice versa
Sh SYNOPSIS
Nm
Op Fl t Ar tabstop
Op Fl t Ar tab1,tab2,...,tabn
Op Ar
Nm unexpand
Op Fl a
Op Fl t Ar tab1,tab2,...,tabn
Op Ar
Sh DESCRIPTION
Nm
processes the named files or the standard input writing
the standard output with tabs changed into blanks.
Backspace characters are preserved into the output and decrement
the column count for tab calculations.
Nm
is useful for pre-processing character files
(before sorting, looking at specific columns, etc.) that
contain tabs.
Pp
If a single
Ar tabstop
argument is given, then tabs are set
Ar tabstop
spaces apart instead of the default 8.
If multiple tabstops are given then the tabs are set at those
specific columns.
Pp
Nm unexpand
puts tabs back into the data from the standard input or the named
files and writes the result on the standard output.
Pp
Option (with
Nm unexpand
only):
Bl -tag -width flag
It Fl a
By default, only leading blanks and tabs
are reconverted to maximal strings of tabs.
If the
Fl a
option is given, then tabs are inserted whenever they would compress the
resultant file by replacing two or more characters.
El
Sh HISTORY
The
Nm
command appeared in
Bx 1 .

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