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authorIndrajith K L2022-12-03 17:00:20 +0530
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+chgrp(P) chgrp(P)
+
+
+
+
+
+NAME
+ chgrp - change the file group ownership
+
+SYNOPSIS
+ chgrp [-hR] group file ...
+
+ chgrp -R [-H | -L | -P ] group file ...
+
+
+DESCRIPTION
+ The chgrp utility shall set the group ID of the file
+ named by each file operand to the group ID specified by
+ the group 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 chgrp 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 argu-
+ ment.
+
+ The user ID of the file shall be used as the
+ owner argument.
+
+ The specified group ID shall be used as the group
+ argument.
+
+ Unless chgrp 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 chgrp 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 group IDs for symbolic
+ links, for each file operand that names a file of
+ type symbolic link, chgrp shall attempt to set
+ the group ID of the symbolic link instead of the
+ file referenced by the symbolic link. If the sys-
+ tem does not support group IDs for symbolic
+ links, for each file operand that names a file of
+ type symbolic link, chgrp 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, chgrp shall change the group
+ 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, chgrp shall change
+ the group of the directory referenced by the sym-
+ bolic 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, chgrp
+ shall change the group ID of the symbolic link if
+ the system supports this operation. The chgrp
+ utility shall not follow the symbolic link to any
+ other part of the file hierarchy.
+
+ -R Recursively change file group IDs. For each file
+ operand that names a directory, chgrp shall
+ change the group 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:
+
+ group A group name from the group database or a numeric
+ group ID. Either specifies a group ID to be given
+ to each file named by one of the file operands.
+ If a numeric group operand exists in the group
+ database as a group name, the group ID number
+ associated with that group name is used as the
+ group ID.
+
+ file A pathname of a file whose group ID is to be mod-
+ ified.
+
+
+STDIN
+ Not used.
+
+INPUT FILES
+ None.
+
+ENVIRONMENT VARIABLES
+ The following environment variables shall affect the
+ execution of chgrp:
+
+ LANG Provide a default value for the internationaliza-
+ tion variables that are unset or null. (See the
+ Base Definitions volume of IEEE Std 1003.1-2001,
+ Section 8.2, Internationalization Variables for
+ the precedence of internationalization variables
+ used to determine the values of locale cate-
+ gories.)
+
+ 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 chgrp to a user
+ with appropriate privileges when the group specified is
+ not the effective group ID or one of the supplementary
+ group IDs of the calling process.
+
+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. The standard developers chose
+ to mask these by specifying only 0 and >0 as exit val-
+ ues.
+
+ The functionality of chgrp is described substantially
+ through references to chown(). In this way, there is no
+ duplication of effort required for describing the inter-
+ actions of permissions, multiple groups, and so on.
+
+FUTURE DIRECTIONS
+ None.
+
+SEE ALSO
+ chmod() , chown() , 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.open-
+ group.org/unix/online.html .
+
+
+
+POSIX 2003 chgrp(P)