1.\" Copyright (c) 1980, 1990 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)expand.1 6.7 (Berkeley) 7/26/91 33.\" 34.Dd July 26, 1991 35.Dt EXPAND 1 36.Os BSD 4 37.Sh NAME 38.Nm expand , 39.Nm unexpand 40.Nd expand tabs to spaces, and vice versa 41.Sh SYNOPSIS 42.Nm expand 43.Op Fl Ns Ar tabstop 44.Op Fl Ns Ar tab1,tab2,...,tabn 45.Ar 46.Nm unexpand 47.Op Fl a 48.Ar 49.Sh DESCRIPTION 50.Nm Expand 51processes the named files or the standard input writing 52the standard output with tabs changed into blanks. 53Backspace characters are preserved into the output and decrement 54the column count for tab calculations. 55.Nm Expand 56is useful for pre-processing character files 57(before sorting, looking at specific columns, etc.) that 58contain tabs. 59.Pp 60If a single 61.Ar tabstop 62argument is given, then tabs are set 63.Ar tabstop 64spaces apart instead of the default 8. 65If multiple tabstops are given then the tabs are set at those 66specific columns. 67.Pp 68.Nm Unexpand 69puts tabs back into the data from the standard input or the named 70files and writes the result on the standard output. 71.Pp 72Option (with 73.Nm unexpand 74only): 75.Bl -tag -width flag 76.It Fl a 77By default, only leading blanks and tabs 78are reconverted to maximal strings of tabs. If the 79.Fl a 80option is given, then tabs are inserted whenever they would compress the 81resultant file by replacing two or more characters. 82.El 83.Sh HISTORY 84The 85.Nm expand 86command appeared in 87.Bx 3.0 . 88