1CHGRP(1P) POSIX Programmer's Manual CHGRP(1P)
2
6 This manual page is part of the POSIX Programmer's Manual. The Linux
7 implementation of this interface may differ (consult the corresponding
8 Linux manual page for details of Linux behavior), or the interface may
9 not be implemented on Linux.
10
12 chgrp - change the file group ownership
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15 chgrp [-hR] group file ...
16 chgrp -R [-H | -L | -P ] group file ...
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21 The chgrp utility shall set the group ID of the file named by each file
22 operand to the group ID specified by the group operand.
23 For each file operand, or, if the -R option is used, each file encoun‐
25 tered while walking the directory trees specified by the file operands,
26 the chgrp utility shall perform actions equivalent to the chown() func‐
27 tion defined in the System Interfaces volume of IEEE Std 1003.1-2001,
28 called with the following arguments:
29 * The file operand shall be used as the path argument.
31 * The user ID of the file shall be used as the owner argument.
33 * The specified group ID shall be used as the group argument.
35 Unless chgrp is invoked by a process with appropriate privileges, the
37 set-user-ID and set-group-ID bits of a regular file shall be cleared
38 upon successful completion; the set-user-ID and set-group-ID bits of
39 other file types may be cleared.
40
42 The chgrp utility shall conform to the Base Definitions volume of
43 IEEE Std 1003.1-2001, Section 12.2, Utility Syntax Guidelines.
44 The following options shall be supported by the implementation:
46 -h If the system supports group IDs for symbolic links, for each
48 file operand that names a file of type symbolic link, chgrp
49 shall attempt to set the group ID of the symbolic link instead
50 of the file referenced by the symbolic link. If the system does
51 not support group IDs for symbolic links, for each file operand
52 that names a file of type symbolic link, chgrp shall do nothing
53 more with the current file and shall go on to any remaining
54 files.
55 -H If the -R option is specified and a symbolic link referencing a
57 file of type directory is specified on the command line, chgrp
58 shall change the group of the directory referenced by the sym‐
59 bolic link and all files in the file hierarchy below it.
60 -L If the -R option is specified and a symbolic link referencing a
62 file of type directory is specified on the command line or
63 encountered during the traversal of a file hierarchy, chgrp
64 shall change the group of the directory referenced by the sym‐
65 bolic link and all files in the file hierarchy below it.
66 -P If the -R option is specified and a symbolic link is specified
68 on the command line or encountered during the traversal of a
69 file hierarchy, chgrp shall change the group ID of the symbolic
70 link if the system supports this operation. The chgrp utility
71 shall not follow the symbolic link to any other part of the file
72 hierarchy.
73 -R Recursively change file group IDs. For each file operand that
75 names a directory, chgrp shall change the group of the directory
76 and all files in the file hierarchy below it. Unless a -H, -L,
77 or -P option is specified, it is unspecified which of these
78 options will be used as the default.
79 Specifying more than one of the mutually-exclusive options -H, -L, and
82 -P shall not be considered an error. The last option specified shall
83 determine the behavior of the utility.
84
86 The following operands shall be supported:
87 group A group name from the group database or a numeric group ID.
89 Either specifies a group ID to be given to each file named by
90 one of the file operands. If a numeric group operand exists in
91 the group database as a group name, the group ID number associ‐
92 ated with that group name is used as the group ID.
93 file A pathname of a file whose group ID is to be modified.
95
98 Not used.
99
101 None.
102
104 The following environment variables shall affect the execution of
105 chgrp:
106 LANG Provide a default value for the internationalization variables
108 that are unset or null. (See the Base Definitions volume of
109 IEEE Std 1003.1-2001, Section 8.2, Internationalization Vari‐
110 ables for the precedence of internationalization variables used
111 to determine the values of locale categories.)
112 LC_ALL If set to a non-empty string value, override the values of all
114 the other internationalization variables.
115 LC_CTYPE
117 Determine the locale for the interpretation of sequences of
118 bytes of text data as characters (for example, single-byte as
119 opposed to multi-byte characters in arguments).
120 LC_MESSAGES
122 Determine the locale that should be used to affect the format
123 and contents of diagnostic messages written to standard error.
124 NLSPATH
126 Determine the location of message catalogs for the processing of
127 LC_MESSAGES .
128
131 Default.
132
134 Not used.
135
137 The standard error shall be used only for diagnostic messages.
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140 None.
141
143 None.
144
146 The following exit values shall be returned:
147 0 The utility executed successfully and all requested changes were
149 made.
150 >0 An error occurred.
152
155 Default.
156 The following sections are informative.
158
160 Only the owner of a file or the user with appropriate privileges may
161 change the owner or group of a file.
162 Some implementations restrict the use of chgrp to a user with appropri‐
164 ate privileges when the group specified is not the effective group ID
165 or one of the supplementary group IDs of the calling process.
166
168 None.
169
171 The System V and BSD versions use different exit status codes. Some
172 implementations used the exit status as a count of the number of errors
173 that occurred; this practice is unworkable since it can overflow the
174 range of valid exit status values. The standard developers chose to
175 mask these by specifying only 0 and >0 as exit values.
176 The functionality of chgrp is described substantially through refer‐
178 ences to chown(). In this way, there is no duplication of effort
179 required for describing the interactions of permissions, multiple
180 groups, and so on.
181
183 None.
184
186 chmod(), chown(), the System Interfaces volume of IEEE Std 1003.1-2001,
187 chown()
188
190 Portions of this text are reprinted and reproduced in electronic form
191 from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
192 -- Portable Operating System Interface (POSIX), The Open Group Base
193 Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
194 Electrical and Electronics Engineers, Inc and The Open Group. In the
195 event of any discrepancy between this version and the original IEEE and
196 The Open Group Standard, the original IEEE and The Open Group Standard
197 is the referee document. The original Standard can be obtained online
198 at http://www.opengroup.org/unix/online.html .
199IEEE/The Open Group 2003 CHGRP(1P)