How to login ssh to server without password using the key?

There is a remote server that I ssh using the key.
Now I want this key to keep on a flash drive, in order to be able to connect from any other machine.
Usually to connect to the remote server use the command
ssh user@domain -pNNN
But when I'm in another comp as me when connecting to specify the path to the key file on a flash drive?
well type ssh user@domain -pNNN /path/to/flash/my.ppk
June 3rd 19 at 19:36
2 answers
June 3rd 19 at 19:38
man ssh
... ssh-i /path/to/private_key
June 3rd 19 at 19:40
# man ssh
 -i identity_file
 Selects a file from which the identity (private key) for public key authentiā€
 cation is read. The default is ~/.ssh/id_dsa, ~/.ssh/id_ecdsa,
 ~/.ssh/id_ed25519 and ~/.ssh/id_rsa. Identity files may also be specified on
 a per-host basis in the configuration file. It is possible to have multiple
 -i options (and multiple identities specified in configuration files). If no
 certificates have been explicitly specified by the CertificateFile directive,
 ssh will also try to load certificate information from the filename obtained
 by appending to identity filenames.

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