1.\" $OpenBSD: gzexe.1,v 1.5 2007/05/31 19:20:08 jmc Exp $ 2.\" 3.\" Copyright (c) 2003 Otto Moerbeek <otto@drijf.net> 4.\" 5.\" Permission to use, copy, modify, and distribute this software for any 6.\" purpose with or without fee is hereby granted, provided that the above 7.\" copyright notice and this permission notice appear in all copies. 8.\" 9.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16.\" 17.Dd $Mdocdate: May 31 2007 $ 18.Dt GZEXE 1 19.Os 20.Sh NAME 21.Nm gzexe 22.Nd create auto-decompressing executables 23.Sh SYNOPSIS 24.Nm gzexe 25.Op Fl d 26.Ar 27.Sh DESCRIPTION 28The 29.Nm 30utility uses 31.Xr gzip 1 32to compress executables, producing executables that decompress on-the-fly 33when executed. 34This saves disk space, at the cost of slower execution times. 35The original executables are saved by copying each of them to a file with 36the same name with a 37.Sq ~ 38suffix appended. 39After verifying that the compressed executables work as expected, the backup 40files can be removed. 41.Pp 42The options are as follows: 43.Bl -tag -width Ds 44.It Fl d 45Decompress executables previously compressed by 46.Nm . 47.El 48.Pp 49The 50.Nm 51program refuses to compress non-regular or non-executable files, 52files with a setuid or setgid bit set, files that are already 53compressed using 54.Nm , 55files in /bin or /sbin, 56or programs it needs to perform on-the-fly decompression: 57.Xr sh 1 , 58.Xr basename 1 , 59.Xr mktemp 1 , 60.Xr rm 1 , 61.Xr echo 1 , 62.Xr tail 1 , 63.Xr gzip 1 , 64and 65.Xr chmod 1 . 66.Sh SEE ALSO 67.Xr compress 1 , 68.Xr gzip 1 69.Sh CAVEATS 70The 71.Nm 72utility replaces files by overwriting them with the generated 73compressed executable. 74To be able to do this, it is required that the original files are writable. 75