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chmod.1 (2010 09)

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chmod(1) chmod(1)
NAME
chmod - change file mode access permissions
SYNOPSIS
/usr/bin/chmod
[-A][-R] symbolic_mode_list file ...
Obsolescent form
/usr/bin/chmod
[-A][-R] numeric_mode file ...
DESCRIPTION
The
chmod command changes the permissions of one or more file s according to the value of
symbolic_mode_list or numeric_mode . You can display the current permissions for a file with the
ls -l
command (see ls(1)).
Only the owner of a file, or a user with appropriate privileges, can change its mode.
Only a user having appropriate privileges can set (or retain, if previously set) the sticky bit of a regular
file.
If the sticky bit is set on a directory, files inside the directory may be renamed or removed only by the
owner of the file, the owner of the directory, or the superuser (even if the modes of the directory would
otherwise allow such an operation).
In order to set the set-group-ID bit, the group of the file must correspond to your current group ID.
If
chmod is used on a symbolic link, the mode of the file referred to by the link is changed.
Options
The
chmod command recognizes the following options:
-A Preserve any optional access control list (ACL) entries associated with the file (HFS file sys-
tems only). By default, in conformance with the IEEE Standard POSIX 1003.1-1988, optional
HFS ACL entries are deleted. For JFS ACLs, this option has no effect, because optional JFS
ACL entries are always preserved. For information about access control lists, see acl (5) and
aclv (5).
-R Recursively change the file mode bits. For each file operand that names a directory,
chmod
alters the file mode bits of the named directory and all files and subdirectories in the file
hierarchy below it.
Operands
The
chmod command recognizes the following operands:
file Targe file for which the permissions are changes.
numeric-mode
Numeric value used to determine permission on a specified file. See the Numeric Mode section
for more information.
symbolic-mode-list
List of operations used to determine permissions on a specified file. See the Symbolic Mode
List section for more information.
Symbolic Mode List
A symbolic_mode_list is a comma-separated list of operations in the following form. Whitespace is not
permitted.
[who]op[permission][,...]
The variable fields can have the following values:
who One or more of the following letters:
u Modify permissions for user (owner).
g Modify permissions for group.
o Modify permissions for others.
a Modify permissions for all users (a is equivalent to ugo).
op Required; one of the following symbols:
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1

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