CHGRP(1)                   POSIX Programmer's Manual                  CHGRP(1)



PPRROOLLOOGG
       This manual page is part of the POSIX Programmer's Manual.  The OS
       implementation of this interface may differ (consult the corresponding
       OS manual page for details of OS behavior), or the interface may not be
       implemented on OS.

NNAAMMEE
       chgrp -- change the file group ownership

SSYYNNOOPPSSIISS
       chgrp [[-h]] _g_r_o_u_p _f_i_l_e...

       chgrp -R [[-H|-L|-P]] _g_r_o_u_p _f_i_l_e...

DDEESSCCRRIIPPTTIIOONN
       The _c_h_g_r_p utility shall set the group ID of the file named by each _f_i_l_e
       operand to the group ID specified by the _g_r_o_u_p operand.

       For each _f_i_l_e operand, or, if the --RR option is used, each file
       encountered while walking the directory trees specified by the _f_i_l_e
       operands, the _c_h_g_r_p utility shall perform actions equivalent to the
       _c_h_o_w_n() function defined in the System Interfaces volume of
       POSIX.1-2017, called with the following arguments:

        *  The _f_i_l_e operand shall be used as the _p_a_t_h argument.

        *  The user ID of the file shall be used as the _o_w_n_e_r argument.

        *  The specified group ID shall be used as the _g_r_o_u_p argument.

       Unless _c_h_g_r_p 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 completion; the set-user-ID and set-group-ID bits of
       other file types may be cleared.

OOPPTTIIOONNSS
       The _c_h_g_r_p utility shall conform to the Base Definitions volume of
       POSIX.1-2017, _S_e_c_t_i_o_n _1_2_._2, _U_t_i_l_i_t_y _S_y_n_t_a_x _G_u_i_d_e_l_i_n_e_s.

       The following options shall be supported by the implementation:

       --hh        For each _f_i_l_e operand that names a file of type symbolic
                 link, _c_h_g_r_p shall attempt to set the group ID of the symbolic
                 link instead of the file referenced by the symbolic link.

       --HH        If the --RR option is specified and a symbolic link referencing
                 a file of type directory is specified on the command line,
                 _c_h_g_r_p shall change the group of the directory referenced by
                 the symbolic link and all files in the file hierarchy below
                 it.

       --LL        If the --RR 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, _c_h_g_r_p
                 shall change the group of the directory referenced by the
                 symbolic link and all files in the file hierarchy below it.

       --PP        If the --RR option is specified and a symbolic link is
                 specified on the command line or encountered during the
                 traversal of a file hierarchy, _c_h_g_r_p shall change the group
                 ID of the symbolic link. The _c_h_g_r_p utility shall not follow
                 the symbolic link to any other part of the file hierarchy.

       --RR        Recursively change file group IDs. For each _f_i_l_e operand that
                 names a directory, _c_h_g_r_p shall change the group of the
                 directory and all files in the file hierarchy below it.
                 Unless a --HH, --LL, or --PP 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 --HH, --LL, and
       --PP shall not be considered an error. The last option specified shall
       determine the behavior of the utility.

OOPPEERRAANNDDSS
       The following operands shall be supported:

       _g_r_o_u_p     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 _f_i_l_e operands. If a numeric _g_r_o_u_p 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.

       _f_i_l_e      A pathname of a file whose group ID is to be modified.

SSTTDDIINN
       Not used.

IINNPPUUTT FFIILLEESS
       None.

EENNVVIIRROONNMMEENNTT VVAARRIIAABBLLEESS
       The following environment variables shall affect the execution of
       _c_h_g_r_p:

       _L_A_N_G      Provide a default value for the internationalization
                 variables that are unset or null. (See the Base Definitions
                 volume of POSIX.1-2017, _S_e_c_t_i_o_n _8_._2, _I_n_t_e_r_n_a_t_i_o_n_a_l_i_z_a_t_i_o_n
                 _V_a_r_i_a_b_l_e_s for the precedence of internationalization
                 variables used to determine the values of locale categories.)

       _L_C___A_L_L    If set to a non-empty string value, override the values of
                 all the other internationalization variables.

       _L_C___C_T_Y_P_E  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).

       _L_C___M_E_S_S_A_G_E_S
                 Determine the locale that should be used to affect the format
                 and contents of diagnostic messages written to standard
                 error.

       _N_L_S_P_A_T_H   Determine the location of message catalogs for the processing
                 of _L_C___M_E_S_S_A_G_E_S.

AASSYYNNCCHHRROONNOOUUSS EEVVEENNTTSS
       Default.

SSTTDDOOUUTT
       Not used.

SSTTDDEERRRR
       The standard error shall be used only for diagnostic messages.

OOUUTTPPUUTT FFIILLEESS
       None.

EEXXTTEENNDDEEDD DDEESSCCRRIIPPTTIIOONN
       None.

EEXXIITT SSTTAATTUUSS
       The following exit values shall be returned:

        0    The utility executed successfully and all requested changes were
             made.

       >0    An error occurred.

CCOONNSSEEQQUUEENNCCEESS OOFF EERRRROORRSS
       Default.

       _T_h_e _f_o_l_l_o_w_i_n_g _s_e_c_t_i_o_n_s _a_r_e _i_n_f_o_r_m_a_t_i_v_e_.

AAPPPPLLIICCAATTIIOONN UUSSAAGGEE
       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 _c_h_g_r_p to a user with
       appropriate privileges when the _g_r_o_u_p specified is not the effective
       group ID or one of the supplementary group IDs of the calling process.

EEXXAAMMPPLLEESS
       None.

RRAATTIIOONNAALLEE
       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 practice 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 values.

       The functionality of _c_h_g_r_p is described substantially through
       references to _c_h_o_w_n().  In this way, there is no duplication of effort
       required for describing the interactions of permissions, multiple
       groups, and so on.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       _c_h_m_o_d, _c_h_o_w_n

       The Base Definitions volume of POSIX.1-2017, _C_h_a_p_t_e_r _8, _E_n_v_i_r_o_n_m_e_n_t
       _V_a_r_i_a_b_l_e_s, _S_e_c_t_i_o_n _1_2_._2, _U_t_i_l_i_t_y _S_y_n_t_a_x _G_u_i_d_e_l_i_n_e_s

       The System Interfaces volume of POSIX.1-2017, _c_h_o_w_n()

CCOOPPYYRRIIGGHHTT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the
       Institute 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 .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .



IEEE/The Open Group                  2017                             CHGRP(1)
