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chmod - change mode of file
The file whose name is given as the null-terminated string pointed to by name has its mode
changed to mode. Modes are constructed by ORing together some combination of the follow-
04000 set user ID on execution
02000 set group ID on execution
01000 save text image after execution
00400 read by owner
00200 write by owner
00100 execute (search on directory) by owner
00070 read, write, execute (search) by group
00007 read, write, execute (search) by others
If an executable file is set up for sharing (-n or -i option of ld(1)) then mode 1000 pre-
vents the system from abandoning the swap-space image of the program-text portion of the
file when its last user terminates. Thus when the next user of the file executes it, the
text need not be read from the file system but can simply be swapped in, saving time.
Ability to set this bit is restricted to the super-user since swap space is consumed by
the images; it is only worth while for heavily used commands.
Only the owner of a file (or the super-user) may change the mode. Only the super-user can
set the 1000 mode.
Zero is returned if the mode is changed; -1 is returned if name cannot be found or if cur-
rent user is neither the owner of the file nor the super-user.
(chmod = 15.)
sys chmod; name; mode
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