Read authorization for everybody on sub-directory owned by root

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setregid

setregid(2)							System Calls Manual						       setregid(2)

NAME

       setregid - sets the real and effective group IDs

SYNOPSIS


DESCRIPTION

       sets the real and effective group IDs of the calling process.

       Only  a privileged process can set the real group ID and/or the effective group ID to any valid value.  A nonprivileged process can set the
       real group ID to the saved set-group-ID from one of the exec family of functions, or the effective group ID to either the saved	set-group-
       ID or the real group ID.

       Any supplementary group IDs of the calling process remain unchanged.

       Argument rgid is the read group ID value to be set with.  If rgid is set to the real group ID is not be changed.

       Argument egid is the effective group ID value to be set with.  If egid is set to -1, the effective group ID is not changed.

       The real and effective group IDs may be set to different values in the same call.

   Security Restrictions
       Some  or  all  of  the actions associated with this system call require the privilege (CHSUBJIDENT).  Processes owned by the superuser will
       have this privilege.  Processes owned by other users may have this privilege, depending on system configuration.

       See privileges(5) for more information about privileged access on systems that support fine-grained privileges.

RETURN VALUE

       Upon successful completion is set to Otherwise, errno is set to indicate the type of error and neither group IDs are changed.

ERRORS

       is set to one of the following values if the corresponding condition is detected.

       The value of the
		      rgid or egid argument is invalid or out-of-range.

       The process does NOT have all the appropriate privileges other
		      than to change the real group ID to the saved set-group-ID, or to change the effective group ID to either the real group	ID
		      or the saved set-group-ID.

AUTHOR

       was developed by the University of California, Berkeley and HP.

SEE ALSO

       exec(2), geteuid(2), getgid(2), getuid(2), setegid(2), setgid(2), setreuid(2), setuid(2).

																       setregid(2)

UNIX for Dummies Questions & Answers