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Annotation of coherent/a/usr/man/COHERENT/chmod.c, revision 1.1.1.1

1.1       root        1: 
                      2: 
                      3: chmod                        Command                        chmod
                      4: 
                      5: 
                      6: 
                      7: 
                      8: Change the modes of a file
                      9: 
                     10: cchhmmoodd +_m_o_d_e_s _f_i_l_e
                     11: cchhmmoodd -_m_o_d_e_s _f_i_l_e
                     12: 
                     13: The COHERENT  system assigns a mode to every  file, to govern how
                     14: users access  the file.  The mode grants  or denies permission to
                     15: read, write, or execute a file.
                     16: 
                     17: The mode grants permission separately  to the owner of a file, to
                     18: users  from the  owner's group,  and to all  other users.   For a
                     19: directory,  execute  permission grants  or  denies  the right  to
                     20: search the  directory, whereas write permission  grants or denies
                     21: the right to create and remove files.
                     22: 
                     23: In addition,  the mode contains  three bits that  perform special
                     24: tasks: the  set-user-id bit, the set-group-id  bit, and the save-
                     25: text or  ``sticky'' bit.  See the Lexicon  entry for the COHERENT
                     26: system call chmod for more information on how to use these bits.
                     27: 
                     28: The command chmod  changes the permissions of each specified file
                     29: according  to the  given mode  argument.  mode  may be  either an
                     30: octal number or a symbolic mode.  Only the owner of a file or the
                     31: superuser may  change a file's mode.  Only  the superuser may set
                     32: the sticky bit.
                     33: 
                     34: A symbolic  mode may have  the following form.   No spaces should
                     35: separate the fields in the actual mode specification.
                     36: 
                     37: 
                     38:              [_w_h_i_c_h] _h_o_w _p_e_r_m ... [, ...]
                     39: 
                     40: 
                     41: which specifies the permissions that are affected by the command.
                     42: It may consist of one or more of the following:
                     43: 
                     44: 
                     45:              aa       All permissions, equivalent to ggoouu
                     46:              gg       Group permissions
                     47:              oo       Other permissions
                     48:              uu       User permissions
                     49: 
                     50: 
                     51: If no which is given, a  is assumed and chmod uses the file crea-
                     52: tion mask, as described in umask.
                     53: 
                     54: how specifies how the permissions will be changed.  It can be
                     55: 
                     56: 
                     57:              =       Set permissions
                     58:              +       Add permissions
                     59:              -       Take away permissions
                     60: 
                     61: 
                     62: 
                     63: 
                     64: COHERENT Lexicon                                           Page 1
                     65: 
                     66: 
                     67: 
                     68: 
                     69: chmod                        Command                        chmod
                     70: 
                     71: 
                     72: 
                     73: 
                     74: perm specifies which  permissions are changed.  It may consist of
                     75: one or more of the following:
                     76: 
                     77: 
                     78:              gg       Current group permissions
                     79:              oo       Current other permissions
                     80:              rr       Read permission
                     81:              ss       Setuid upon execution
                     82:              tt       Save text (sticky bit)
                     83:              uu       Current user permissions
                     84:              ww       Write permission
                     85:              xx       Execute permission
                     86: 
                     87: 
                     88: Multiple _h_o_w/_p_e_r_m pairs have the same which applied to them.  One
                     89: or more  specifications separated by  commas tell chmod  to apply
                     90: each specification to the file successively.
                     91: 
                     92: The octal modes (see stat) are as follows:
                     93: 
                     94: 
                     95:          0044000000    Set user id upon execution
                     96:          0022000000    Set group id upon execution
                     97:          0011000000    Sticky bit (save text)
                     98:          0000440000    Owner read permission
                     99:          0000220000    Owner write permission
                    100:          0000110000    Owner execute permission
                    101:          0000004400    Group read permission
                    102:          0000002200    Group write permission
                    103:          0000001100    Group execute permission
                    104:          0000000044    Others read permission
                    105:          0000000022    Others write permission
                    106:          0000000011    Others execute permission
                    107: 
                    108: 
                    109: An octal mode argument to  chmod is obtained by oring the desired
                    110: mode bits together.
                    111: 
                    112: ***** Examples *****
                    113: 
                    114: The first  example below sets  the owner's permissions  to read +
                    115: write +  execute, and the  group and other permissions  to read +
                    116: execute.   The   second  example  adds   execute  permission  for
                    117: everyone.
                    118: 
                    119: 
                    120:     chmod u=rwx,go=rx file
                    121:     chmod +x file
                    122: 
                    123: 
                    124: ***** See Also *****
                    125: 
                    126: chgrp, chown, commands, ls, stat, umask
                    127: 
                    128: 
                    129: 
                    130: COHERENT Lexicon                                           Page 2
                    131: 
                    132: 

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