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+CHMOD(1) User Commands CHMOD(1)
+
+
+
+
+
+NAME
+ chmod - change file access permissions
+
+SYNOPSIS
+ chmod [OPTION]... MODE[,MODE]... FILE...
+ chmod [OPTION]... OCTAL-MODE FILE...
+ chmod [OPTION]... --reference=RFILE FILE...
+
+DESCRIPTION
+ This manual page documents the GNU version of chmod.
+ chmod changes the permissions of each given file accord-
+ ing to mode, which can be either a symbolic representa-
+ tion of changes to make, or an octal number representing
+ the bit pattern for the new permissions.
+
+ The format of a symbolic mode is `[ugoa...][[+-=][rwxXs-
+ tugo...]...][,...]'. Multiple symbolic operations can
+ be given, separated by commas.
+
+ A combination of the letters `ugoa' controls which
+ users' access to the file will be changed: the user who
+ owns it (u), other users in the file's group (g), other
+ users not in the file's group (o), or all users (a). If
+ none of these are given, the effect is as if `a' were
+ given, but bits that are set in the umask are not
+ affected.
+
+ The operator `+' causes the permissions selected to be
+ added to the existing permissions of each file; `-'
+ causes them to be removed; and `=' causes them to be the
+ only permissions that the file has.
+
+ The letters `rwxXstugo' select the new permissions for
+ the affected users: read (r), write (w), execute (or
+ access for directories) (x), execute only if the file is
+ a directory or already has execute permission for some
+ user (X), set user or group ID on execution (s), sticky
+ (t), the permissions granted to the user who owns the
+ file (u), the permissions granted to other users who are
+ members of the file's group (g), and the permissions
+ granted to users that are in neither of the two preced-
+ ing categories (o).
+
+ A numeric mode is from one to four octal digits (0-7),
+ derived by adding up the bits with values 4, 2, and 1.
+ Any omitted digits are assumed to be leading zeros. The
+ first digit selects the set user ID (4) and set group ID
+ (2) and sticky (1) attributes. The second digit selects
+ permissions for the user who owns the file: read (4),
+ write (2), and execute (1); the third selects permis-
+ sions for other users in the file's group, with the same
+ values; and the fourth for other users not in the file's
+ group, with the same values.
+
+ chmod never changes the permissions of symbolic links;
+ the chmod system call cannot change their permissions.
+ This is not a problem since the permissions of symbolic
+ links are never used. However, for each symbolic link
+ listed on the command line, chmod changes the permis-
+ sions of the pointed-to file. In contrast, chmod
+ ignores symbolic links encountered during recursive
+ directory traversals.
+
+STICKY FILES
+ On older Unix systems, the sticky bit caused executable
+ files to be hoarded in swap space. This feature is not
+ useful on modern VM systems, and the Linux kernel
+ ignores the sticky bit on files. Other kernels may use
+ the sticky bit on files for system-defined purposes. On
+ some systems, only the superuser can set the sticky bit
+ on files.
+
+STICKY DIRECTORIES
+ When the sticky bit is set on a directory, files in that
+ directory may be unlinked or renamed only by root or
+ their owner. Without the sticky bit, anyone able to
+ write to the directory can delete or rename files. The
+ sticky bit is commonly found on directories, such as
+ /tmp, that are world-writable.
+
+OPTIONS
+ Change the mode of each FILE to MODE.
+
+ -c, --changes
+ like verbose but report only when a change is
+ made
+
+ --no-preserve-root
+ do not treat `/' specially (the default)
+
+ --preserve-root
+ fail to operate recursively on `/'
+
+ -f, --silent, --quiet
+ suppress most error messages
+
+ -v, --verbose
+ output a diagnostic for every file processed
+
+ --reference=RFILE
+ use RFILE's mode instead of MODE values
+
+ -R, --recursive
+ change files and directories recursively
+
+ --help display this help and exit
+
+ --version
+ output version information and exit
+
+ Each MODE is one or more of the letters ugoa, one of the
+ symbols +-= and one or more of the letters rwxXstugo.
+
+AUTHOR
+ Written by David MacKenzie and Jim Meyering.
+
+REPORTING BUGS
+ Report bugs to <bug-coreutils@gnu.org>.
+
+COPYRIGHT
+ Copyright (C) 2004 Free Software Foundation, Inc.
+ This is free software; see the source for copying condi-
+ tions. There is NO warranty; not even for MERCHANTABIL-
+ ITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+SEE ALSO
+ The full documentation for chmod is maintained as a Tex-
+ info manual. If the info and chmod programs are prop-
+ erly installed at your site, the command
+
+ info chmod
+
+ should give you access to the complete manual.
+
+
+
+chmod 5.3.0 November 2004 CHMOD(1)