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The database argument may be one of:

Database

Display format
ethers	address name
group	group:passwd:gid:[member[,member]...]
hosts	address name [alias ...]
netgroup	(host,user,domain) [...]
networks	name network [alias ...]
passwd	user:passwd:uid:gid:gecos:home_dir:shell
protocols	name protocol [alias ...]
rpc	name number [alias ...]
services	name port/protocol [alias ...]
shells	/path/to/shell
utmpx	[time] type: properties

If one or more key arguments are provided, they will be looked up in database using the appropriate function. For example, "passwd" supports a numeric UID or user name; "hosts" supports an IPv4 address, IPv6 address, or host name; and "services" supports a service name, service name/protocol name, numeric port, or numeric port/protocol name.

If no key is provided and database supports enumeration, all entries for database will be retrieved using the appropriate enumeration function and printed.