#### 31.14.1 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.