1.\" $OpenBSD: expand.1,v 1.7 2000/03/07 21:11:08 aaron Exp $ 2.\" $NetBSD: expand.1,v 1.3 1995/09/02 06:19:45 jtc Exp $ 3.\" 4.\" Copyright (c) 1980, 1990, 1993 5.\" The Regents of the University of California. All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. All advertising materials mentioning features or use of this software 16.\" must display the following acknowledgement: 17.\" This product includes software developed by the University of 18.\" California, Berkeley and its contributors. 19.\" 4. Neither the name of the University nor the names of its contributors 20.\" may be used to endorse or promote products derived from this software 21.\" without specific prior written permission. 22.\" 23.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33.\" SUCH DAMAGE. 34.\" 35.\" @(#)expand.1 8.1 (Berkeley) 6/9/93 36.\" 37.Dd June 9, 1993 38.Dt EXPAND 1 39.Os 40.Sh NAME 41.Nm expand , 42.Nm unexpand 43.Nd expand tabs to spaces, and vice versa 44.Sh SYNOPSIS 45.Nm expand 46.Op Fl Ns Ar tabstop 47.Op Fl Ns Ar tab1 , tab2 , ... , tabn 48.Op Ar file Ar ... 49.Nm unexpand 50.Op Fl a 51.Op Ar file Ar ... 52.Sh DESCRIPTION 53.Nm expand 54processes the named files or the standard input writing 55the standard output with tabs changed into blanks. 56Backspace characters are preserved into the output and decrement 57the column count for tab calculations. 58.Nm expand 59is useful for pre-processing character files 60(before sorting, looking at specific columns, etc.) that 61contain tabs. 62.Pp 63If a single 64.Ar tabstop 65argument is given, tabs are set 66.Ar tabstop 67spaces apart instead of the default 8. 68If multiple tabstops are given then the tabs are set at those 69specific columns. 70.Pp 71.Nm unexpand 72puts tabs back into the data from the standard input or the named 73files and writes the result on the standard output. 74.Pp 75The options (for 76.Nm unexpand 77only) are as follows: 78.Bl -tag -width flag 79.It Fl a 80By default, only leading blanks and tabs 81are reconverted to maximal strings of tabs. 82If the 83.Fl a 84option is given, tabs are inserted whenever they would compress the 85resultant file by replacing two or more characters. 86.El 87.Sh SEE ALSO 88.Xr fold 1 89.Sh HISTORY 90The 91.Nm expand 92command appeared in 93.Bx 3.0 . 94