cf-key

--help, -h
    Print the help message

--debug, -d
    Enable debugging output

--verbose, -v
    Output verbose information about the behaviour of the agent

--version, -V
    Output the version of the software

--output-file, -f
    Specify an alternative output file than the default (localhost)

--show-hosts, -s
    Show lastseen hostnames and IP addresses

--remove-keys, -r
    Remove keys for specified hostname/IP

--install-license, -l
    Install license without boostrapping (CFEngine Enterprise only)

--print-digest, -p
    Print digest of the specified public key

--trust-key, -t
    Make cf-serverd/cf-agent trust the specified public key

--color, -C
    Enable colorized output. Possible values: 'always', 'auto', 'never'. Default is 'never'