chmod 1.2 KB

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  1. .TH CHMOD 1
  2. .SH NAME
  3. chmod \- change mode
  4. .SH SYNOPSIS
  5. .B chmod
  6. .I mode file ...
  7. .SH DESCRIPTION
  8. The mode of
  9. each named file
  10. is changed
  11. according to
  12. .IR mode,
  13. which may be an octal number or a symbolic change to the existing mode.
  14. A
  15. .I mode
  16. is an octal
  17. number constructed
  18. from the OR of the
  19. following modes.
  20. .TF 0000
  21. .TP
  22. 0400
  23. read by owner
  24. .TP
  25. 0200
  26. write by owner
  27. .TP
  28. 0100
  29. execute (search in directory) by owner
  30. .TP
  31. 0070
  32. read, write, execute (search) by group
  33. .TP
  34. 0007
  35. read, write, execute (search) by others
  36. .PD
  37. .PP
  38. A symbolic
  39. .I mode
  40. has the form:
  41. .IP
  42. .RI [who]
  43. .I op permission
  44. .PP
  45. The
  46. .I who
  47. part is a combination
  48. of the letters
  49. .B u
  50. (for user's permissions),
  51. .B g
  52. (group)
  53. and
  54. .B o
  55. (other).
  56. The letter
  57. .B a
  58. stands for
  59. .BR ugo .
  60. If
  61. .I who
  62. is omitted,
  63. the default is
  64. .BR a .
  65. .PP
  66. .I Op
  67. can be
  68. .B +
  69. to add
  70. .I permission
  71. to the file's mode,
  72. .B -
  73. to take away
  74. .IR permission ,
  75. and
  76. .B =
  77. to assign
  78. .I permission
  79. absolutely
  80. (all other bits will
  81. be reset).
  82. .PP
  83. .I Permission
  84. is any combination of the letters
  85. .B r
  86. (read),
  87. .B w
  88. (write),
  89. .B x
  90. (execute),
  91. .B a
  92. (append only),
  93. and
  94. .B l
  95. (exclusive access).
  96. .PP
  97. Only the owner of a file or the group leader of its group
  98. may change the file's mode.
  99. .SH SOURCE
  100. .B /sys/src/cmd/chmod.c
  101. .SH "SEE ALSO"
  102. .IR ls (1),
  103. .IR stat (2),
  104. .IR stat (5)