/usr.bin/gzip/gzexe.1

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  1. .\"	$NetBSD: gzexe.1,v 1.3 2003/12/28 12:49:41 wiz Exp $
    2. 

  2. .\"	$OpenBSD: gzexe.1,v 1.1 2003/07/31 07:32:47 otto Exp $
    3. 

  3. .\"
    4. 

  4. .\" Copyright (c) 2003 Otto Moerbeek <otto@drijf.net>
    5. 

  5. .\"
    6. 

  6. .\" Permission to use, copy, modify, and distribute this software for any
    7. 

  7. .\" purpose with or without fee is hereby granted, provided that the above
    8. 

  8. .\" copyright notice and this permission notice appear in all copies.
    9. 

  9. .\"
    10. 

  10. .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    11. 

  11. .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
    12. 

  12. .\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    13. 

  13. .\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    14. 

  14. .\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
    15. 

  15. .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    16. 

  16. .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
    17. 

  17. .\"
    18. 

  18. .\" $FreeBSD$
    19. 

  19. .Dd January 26, 2007
    20. 

  20. .Dt GZEXE 1
    21. 

  21. .Os
    22. 

  22. .Sh NAME
    23. 

  23. .Nm gzexe
    24. 

  24. .Nd create auto-decompressing executables
    25. 

  25. .Sh SYNOPSIS
    26. 

  26. .Nm gzexe
    27. 

  27. .Op Fl d
    28. 

  28. .Ar
    29. 

  29. .Sh DESCRIPTION
    30. 

  30. The
    31. 

  31. .Nm
    32. 

  32. utility uses
    33. 

  33. .Xr gzip 1
    34. 

  34. to compress executables, producing executables that decompress on-the-fly
    35. 

  35. when executed.
    36. 

  36. This saves disk space, at the cost of slower execution times.
    37. 

  37. The original executables are saved by copying each of them to a file with
    38. 

  38. the same name with a
    39. 

  39. .Sq ~
    40. 

  40. suffix appended.
    41. 

  41. After verifying that the compressed executables work as expected, the backup
    42. 

  42. files can be removed.
    43. 

  43. .Pp
    44. 

  44. The options are as follows:
    45. 

  45. .Bl -tag -width Ds
    46. 

  46. .It Fl d
    47. 

  47. Decompress executables previously compressed by
    48. 

  48. .Nm .
    49. 

  49. .El
    50. 

  50. .Pp
    51. 

  51. The
    52. 

  52. .Nm
    53. 

  53. program refuses to compress non-regular or non-executable files,
    54. 

  54. files with a setuid or setgid bit set, files that are already
    55. 

  55. compressed using
    56. 

  56. .Nm
    57. 

  57. or programs it needs to perform on-the-fly decompression:
    58. 

  58. .Xr sh 1 ,
    59. 

  59. .Xr mktemp 1 ,
    60. 

  60. .Xr rm 1 ,
    61. 

  61. .Xr echo 1 ,
    62. 

  62. .Xr tail 1 ,
    63. 

  63. .Xr gzip 1 ,
    64. 

  64. and
    65. 

  65. .Xr chmod 1 .
    66. 

  66. .Sh SEE ALSO
    67. 

  67. .Xr gzip 1
    68. 

  68. .Sh CAVEATS
    69. 

  69. The
    70. 

  70. .Nm
    71. 

  71. utility replaces files by overwriting them with the generated
    72. 

  72. compressed executable.
    73. 

  73. To be able to do this, it is required that the original files are writable.
    74.