UNIX user and group functions

Group Information Hash

Key	Type	Description
`gr_name`	string	The name of the group
`gr_passwd`	string	The encrypted password for the group
`gr_gid`	int	The group id
`gr_mem`	list	List of strings giving the usernames of members of the group

Password Information Hash

Key	Type	Description
`pw_name`	string	The username of the user
`pw_passwd`	string	The encrypted password for the user
`pw_gecos`	string	The real name or description of the user
`pw_dir`	string	The user's home directory
`pw_shell`	string	The user's login shell
`pw_uid`	int	The user's userid
`pw_gid`	int	The group id of the user's primary group