3.8.3.18 -i: specify an SSH private key

The -i option allows you to specify the name of a private key file in *.PPK format which PuTTY will use to authenticate with the server. This option is only meaningful if you are using SSH.

For general information on public-key authentication, see chapter 8.

This option is equivalent to the ‘Private key file for authentication’ box in the Auth panel of the PuTTY configuration box (see section 4.20.7).