1.\" $NetBSD: expand.1,v 1.6 1999/03/22 18:16:36 garbled Exp $ 2.\" 3.\" Copyright (c) 1980, 1990, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" @(#)expand.1 8.1 (Berkeley) 6/9/93 35.\" 36.Dd June 9, 1993 37.Dt EXPAND 1 38.Os 39.Sh NAME 40.Nm expand , 41.Nm unexpand 42.Nd expand tabs to spaces, and vice versa 43.Sh SYNOPSIS 44.Nm 45.Op Fl t Ar tabstop 46.Op Fl t Ar tab1,tab2,...,tabn 47.Op Ar 48.Nm unexpand 49.Op Fl a 50.Op Ar 51.Sh DESCRIPTION 52.Nm 53processes the named files or the standard input writing 54the standard output with tabs changed into blanks. 55Backspace characters are preserved into the output and decrement 56the column count for tab calculations. 57.Nm 58is useful for pre-processing character files 59(before sorting, looking at specific columns, etc.) that 60contain tabs. 61.Pp 62If a single 63.Ar tabstop 64argument is given, then tabs are set 65.Ar tabstop 66spaces apart instead of the default 8. 67If multiple tabstops are given then the tabs are set at those 68specific columns. 69.Pp 70.Nm unexpand 71puts tabs back into the data from the standard input or the named 72files and writes the result on the standard output. 73.Pp 74Option (with 75.Nm unexpand 76only): 77.Bl -tag -width flag 78.It Fl a 79By default, only leading blanks and tabs 80are reconverted to maximal strings of tabs. If the 81.Fl a 82option is given, then tabs are inserted whenever they would compress the 83resultant file by replacing two or more characters. 84.El 85.Sh HISTORY 86The 87.Nm 88command appeared in 89.Bx 3.0 . 90