The --help prints out a usage message to standard output.

-b, --bits <bits>

Number of bits in the key to create.

-f, --filename <file name>

Filename of the key file.

-t, --type <type>

Type of key (rsa or dsa).

-C, --comment <comment>

Provide a new comment.

-N, --newpass <pass phrase>

Provide new passphrase.

-P, --pass <pass phrase>

Provide old passphrase.

-l, --fingerprint

Show fingerprint of key file.

-p, --changepass

Change passphrase of private key file.

-q, --quiet

Be quiet.

-y, --showpub

Show public key.