grp.h, grp - group structure
The <grp.h> header declares the structure group, which includes the following members:
char *gr_name /* name of the group */ gid_t gr_gid /* numerical group ID */ char **gr_mem /* pointer to a null-terminated array of character pointers to member names */
The gid_t type is defined as described in <sys/types.h> (see types(3HEAD)).
See attributes(5) for descriptions of the following attributes: