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+.\" Copyright (c) 1980, 1990, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    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.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 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
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)expand.1	8.1 (Berkeley) 6/9/93
+.\"
+.Dd June 9, 1993
+.Dt EXPAND 1
+.Os BSD 4
+.Sh NAME
+.Nm expand ,
+.Nm unexpand
+.Nd expand tabs to spaces, and vice versa
+.Sh SYNOPSIS
+.Nm expand
+.Op Fl Ns Ar tabstop
+.Op Fl Ns Ar tab1,tab2,...,tabn
+.Ar
+.Nm unexpand
+.Op Fl a
+.Ar
+.Sh DESCRIPTION
+.Nm Expand
+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 Expand
+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 expand
+command appeared in
+.Bx 3.0 .