-.It Fl y
-This option will read a private
-OpenSSH format file and print an OpenSSH public key to stdout.
-.It Fl t Ar type
-Specifies the type of the key to create.
-The possible values are
-.Dq rsa1
-for protocol version 1 and
-.Dq rsa
-or
-.Dq dsa
-for protocol version 2.
-.It Fl B
-Show the bubblebabble digest of specified private or public key file.
-.It Fl C Ar comment
-Provides the new comment.
-.It Fl D Ar reader
-Download the RSA public key stored in the smartcard in
-.Ar reader .
-.It Fl F Ar hostname
-Search for the specified
-.Ar hostname
-in a
-.Pa known_hosts
-file, listing any occurances found.
-This option is useful to find hashed host names or addresses and may also be
-used in conjunction with the
-.Fl H
-option to print found keys in a hashed format.
-.It Fl H
-Hash a
-.Pa known_hosts
-file, printing the result to standard output.
-This replaces all hostnames and addresses with hashed representations.
-These hashes may be used normally by
-.Nm ssh
-and
-.Nm sshd ,
-but they do not reveal identifying information should the file's contents
-be disclosed.
-This option will not modify existing hashed hostnames and is therefore safe
-to use on files that mix hashed and non-hashed names.