-i identity_file
             Selects a file from which the identity (private key) for public key authentication is read.  The default is ~/.ssh/identity for
             protocol version 1, and ~/.ssh/id_dsa, ~/.ssh/id_ecdsa and ~/.ssh/id_rsa for protocol version 2.  Identity files may also be speci‐
             fied on a per-host basis in the configuration file.  It is possible to have multiple -i options (and multiple identities specified
             in configuration files).  ssh will also try to load certificate information from the filename obtained by appending -cert.pub to
             identity filenames.