If this option is present, the password argument is assumed to already be encrypted. This option is mutually exclusive with --plaintext. To create an encrypted password, you can use Python:

$ python -c 'import crypt; print(crypt.crypt("My Password", "$6$My Salt"))'

This will generate a SHA512 crypt of your password using your provided salt.

If this option is present, the password argument is assumed to be in plain text. This option is mutually exclusive with --iscrypted.

If this option is present, the root account is locked by default. This means that the root user will not be able to log in from the console.