Rapid Dr3am
Dedicated User
Joined: 25 Jan 2003
Posts: 8319
Location: Not here
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 Posted: June 18th 2003, 8:00 am Post subject: CHMOD File Permissions |
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What is CHMOD?
The CHMOD utility modifies the file mode bits of the listed files as
specified by the mode operand.
Possible options
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-f Do not display a diagnostic message if cCHMOD could not modify the
mode for file, nor modify the exit status to reflect such fail-
ures.
-H If the -R option is specified, symbolic links on the command line
are followed. (Symbolic links encountered in the tree traversal
are not followed by default.)
-h If the file is a symbolic link, change the mode of the link
itself rather than the file that the link points to.
-L If the -R option is specified, all symbolic links are followed.
-P If the -R option is specified, no symbolic links are followed.
This is the default.
-R Change the modes of the file hierarchies rooted in the files
instead of just the files themselves.
-v Cause chmod to be verbose, showing filenames as the mode is modi-
fied.
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(The -H, -L and -P options are ignored unless the -R option is specified.
In addition, these options override each other and the command's actions
are determined by the last one specified.)
Modes
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4000 Executable files with this bit set will
run with effective uid set to the uid of the file owner.
Directories with this bit set will force all files and sub-
directories created in them to be owned by the directory
owner and not by the uid of the creating process, if the
underlying file system supports this feature:
2000 Executable files with this bit set will
run with effective gid set to the gid of the file owner.
0400 Allow read by owner.
0200 Allow write by owner.
0100 For files, allow execution by owner. For directories,
allow the owner to search in the directory.
0040 Allow read by group members.
0020 Allow write by group members.
0010 For files, allow execution by group members. For directo-
ries, allow group members to search in the directory.
0004 Allow read by others.
0002 Allow write by others.
0001 For files, allow execution by others. For directories
allow others to search in the directory.
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Perm symbols
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r The read bits.
s The set-user-ID-on-execution and set-group-ID-on-execution
bits.
t The sticky bit.
w The write bits.
x The execute/search bits.
X The execute/search bits if the file is a directory or any
of the execute/search bits are set in the original (unmodi-
fied) mode. Operations with the perm symbol ``X'' are only
meaningful in conjunction with the op symbol ``+'', and are
ignored in all other cases.
u The user permission bits in the original mode of the file.
g The group permission bits in the original mode of the file.
o The other permission bits in the original mode of the file.
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OP symbols
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+ If no value is supplied for perm, the ``+'' operation has no
effect. If no value is supplied for who, each permission bit spec-
ified in perm, for which the corresponding bit in the file mode
creation mask is clear, is set. Otherwise, the mode bits repre-
sented by the specified who and perm values are set.
- If no value is supplied for perm, the ``-'' operation has no
effect. If no value is supplied for who, each permission bit spec-
ified in perm, for which the corresponding bit in the file mode
creation mask is clear, is cleared. Otherwise, the mode bits rep-
resented by the specified who and perm values are cleared.
= The mode bits specified by the who value are cleared, or, if no who
value is specified, the owner, group and other mode bits are
cleared. Then, if no value is supplied for who, each permission
bit specified in perm, for which the corresponding bit in the file
mode creation mask is clear, is set. Otherwise, the mode bits rep-
resented by the specified who and perm values are set.
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