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+chown(P) chown(P)
+
+
+
+
+
+NAME
+ chown - change the file ownership
+
+SYNOPSIS
+ chown [-hR] owner[:group] file ...
+
+ chown -R [-H | -L | -P ] owner[:group] file ...
+
+
+DESCRIPTION
+ The chown utility shall set the user ID of the file
+ named by each file operand to the user ID specified by
+ the owner operand.
+
+ For each file operand, or, if the -R option is used,
+ each file encountered while walking the directory trees
+ specified by the file operands, the chown utility shall
+ perform actions equivalent to the chown() function
+ defined in the System Interfaces volume of
+ IEEE Std 1003.1-2001, called with the following argu-
+ ments:
+
+ The file operand shall be used as the path argument.
+
+ The user ID indicated by the owner portion of the first
+ operand shall be used as the owner argument.
+
+ If the group portion of the first operand is given, the
+ group ID indicated by it shall be used as the group
+ argument; otherwise, the group ownership shall not be
+ changed.
+
+ Unless chown is invoked by a process with appropriate
+ privileges, the set-user-ID and set-group-ID bits of a
+ regular file shall be cleared upon successful comple-
+ tion; the set-user-ID and set-group-ID bits of other
+ file types may be cleared.
+
+OPTIONS
+ The chown utility shall conform to the Base Definitions
+ volume of IEEE Std 1003.1-2001, Section 12.2, Utility
+ Syntax Guidelines.
+
+ The following options shall be supported by the imple-
+ mentation:
+
+ -h If the system supports user IDs for symbolic
+ links, for each file operand that names a file of
+ type symbolic link, chown shall attempt to set
+ the user ID of the symbolic link. If the system
+ supports group IDs for symbolic links, and a
+ group ID was specified, for each file operand
+ that names a file of type symbolic link, chown
+ shall attempt to set the group ID of the symbolic
+ link. If the system does not support user or
+ group IDs for symbolic links, for each file oper-
+ and that names a file of type symbolic link,
+ chown shall do nothing more with the current file
+ and shall go on to any remaining files.
+
+ -H If the -R option is specified and a symbolic link
+ referencing a file of type directory is specified
+ on the command line, chown shall change the user
+ ID (and group ID, if specified) of the directory
+ referenced by the symbolic link and all files in
+ the file hierarchy below it.
+
+ -L If the -R option is specified and a symbolic link
+ referencing a file of type directory is specified
+ on the command line or encountered during the
+ traversal of a file hierarchy, chown shall change
+ the user ID (and group ID, if specified) of the
+ directory referenced by the symbolic link and all
+ files in the file hierarchy below it.
+
+ -P If the -R option is specified and a symbolic link
+ is specified on the command line or encountered
+ during the traversal of a file hierarchy, chown
+ shall change the owner ID (and group ID, if spec-
+ ified) of the symbolic link if the system sup-
+ ports this operation. The chown utility shall not
+ follow the symbolic link to any other part of the
+ file hierarchy.
+
+ -R Recursively change file user and group IDs. For
+ each file operand that names a directory, chown
+ shall change the user ID (and group ID, if speci-
+ fied) of the directory and all files in the file
+ hierarchy below it. Unless a -H, -L, or -P option
+ is specified, it is unspecified which of these
+ options will be used as the default.
+
+
+ Specifying more than one of the mutually-exclusive
+ options -H, -L, and -P shall not be considered an error.
+ The last option specified shall determine the behavior
+ of the utility.
+
+OPERANDS
+ The following operands shall be supported:
+
+ owner[:group]
+ A user ID and optional group ID to be assigned to
+ file. The owner portion of this operand shall be
+ a user name from the user database or a numeric
+ user ID. Either specifies a user ID which shall
+ be given to each file named by one of the file
+ operands. If a numeric owner operand exists in
+ the user database as a user name, the user ID
+ number associated with that user name shall be
+ used as the user ID. Similarly, if the group por-
+ tion of this operand is present, it shall be a
+ group name from the group database or a numeric
+ group ID. Either specifies a group ID which shall
+ be given to each file. If a numeric group operand
+ exists in the group database as a group name, the
+ group ID number associated with that group name
+ shall be used as the group ID.
+
+ file A pathname of a file whose user ID is to be modi-
+ fied.
+
+
+STDIN
+ Not used.
+
+INPUT FILES
+ None.
+
+ENVIRONMENT VARIABLES
+ The following environment variables shall affect the
+ execution of chown:
+
+ LANG Provide a default value for the
+ internationalization variables that are unset or
+ null. (See the Base Definitions volume of
+ IEEE Std 1003.1-2001, Section 8.2, International-
+ ization Variables for the precedence of interna-
+ tionalization variables used to determine the
+ values of locale categories.)
+
+ LC_ALL If set to a non-empty string value, override the
+ values of all the other internationalization
+ variables.
+
+ LC_CTYPE
+ Determine the locale for the interpretation of
+ sequences of bytes of text data as characters
+ (for example, single-byte as opposed to multi-
+ byte characters in arguments).
+
+ LC_MESSAGES
+ Determine the locale that should be used to
+ affect the format and contents of diagnostic mes-
+ sages written to standard error.
+
+ NLSPATH
+ Determine the location of message catalogs for
+ the processing of LC_MESSAGES .
+
+
+ASYNCHRONOUS EVENTS
+ Default.
+
+STDOUT
+ Not used.
+
+STDERR
+ The standard error shall be used only for diagnostic
+ messages.
+
+OUTPUT FILES
+ None.
+
+EXTENDED DESCRIPTION
+ None.
+
+EXIT STATUS
+ The following exit values shall be returned:
+
+ 0 The utility executed successfully and all
+ requested changes were made.
+
+ >0 An error occurred.
+
+
+CONSEQUENCES OF ERRORS
+ Default.
+
+ The following sections are informative.
+
+APPLICATION USAGE
+ Only the owner of a file or the user with appropriate
+ privileges may change the owner or group of a file.
+
+ Some implementations restrict the use of chown to a user
+ with appropriate privileges.
+
+EXAMPLES
+ None.
+
+RATIONALE
+ The System V and BSD versions use different exit status
+ codes. Some implementations used the exit status as a
+ count of the number of errors that occurred; this prac-
+ tice is unworkable since it can overflow the range of
+ valid exit status values. These are masked by specifying
+ only 0 and >0 as exit values.
+
+ The functionality of chown is described substantially
+ through references to functions in the System Interfaces
+ volume of IEEE Std 1003.1-2001. In this way, there is no
+ duplication of effort required for describing the inter-
+ actions of permissions, multiple groups, and so on.
+
+ The 4.3 BSD method of specifying both owner and group
+ was included in this volume of IEEE Std 1003.1-2001
+ because:
+
+ There are cases where the desired end condition
+ could not be achieved using the chgrp and chown
+ (that only changed the user ID) utilities. (If
+ the current owner is not a member of the desired
+ group and the desired owner is not a member of
+ the current group, the chown() function could
+ fail unless both owner and group are changed at
+ the same time.)
+
+ Even if they could be changed independently, in
+ cases where both are being changed, there is a
+ 100% performance penalty caused by being forced
+ to invoke both utilities.
+
+ The BSD syntax user[. group] was changed to user[:
+ group] in this volume of IEEE Std 1003.1-2001 because
+ the period is a valid character in login names (as spec-
+ ified by the Base Definitions volume of
+ IEEE Std 1003.1-2001, login names consist of characters
+ in the portable filename character set). The colon char-
+ acter was chosen as the replacement for the period char-
+ acter because it would never be allowed as a character
+ in a user name or group name on historical implementa-
+ tions.
+
+ The -R option is considered by some observers as an
+ undesirable departure from the historical UNIX system
+ tools approach; since a tool, find, already exists to
+ recurse over directories, there seemed to be no good
+ reason to require other tools to have to duplicate that
+ functionality. However, the -R option was deemed an
+ important user convenience, is far more efficient than
+ forking a separate process for each element of the
+ directory hierarchy, and is in widespread historical
+ use.
+
+FUTURE DIRECTIONS
+ None.
+
+SEE ALSO
+ chmod , chgrp , the System Interfaces volume of
+ IEEE Std 1003.1-2001, chown()
+
+COPYRIGHT
+ Portions of this text are reprinted and reproduced in
+ electronic form from IEEE Std 1003.1, 2003 Edition,
+ Standard for Information Technology -- Portable Operat-
+ ing System Interface (POSIX), The Open Group Base Speci-
+ fications Issue 6, Copyright (C) 2001-2003 by the Insti-
+ tute of Electrical and Electronics Engineers, Inc and
+ The Open Group. In the event of any discrepancy between
+ this version and the original IEEE and The Open Group
+ Standard, the original IEEE and The Open Group Standard
+ is the referee document. The original Standard can be
+ obtained online at
+ http://www.opengroup.org/unix/online.html .
+
+
+
+POSIX 2003 chown(P)