(libc.info.gz) Group Data Structure

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 29.14.1 The Data Structure for a Group
 --------------------------------------
 
 The functions and data structures for accessing the system group
 database are declared in the header file `grp.h'.  
 
  -- Data Type: struct group
      The `group' structure is used to hold information about an entry in
      the system group database.  It has at least the following members:
 
     `char *gr_name'
           The name of the group.
 
     `gid_t gr_gid'
           The group ID of the group.
 
     `char **gr_mem'
           A vector of pointers to the names of users in the group.
           Each user name is a null-terminated string, and the vector
           itself is terminated by a null pointer.
 

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