protonvpn-cli-connect
Official client to connect to ProtonVPN from the command-line.
TLDR
Connect to ProtonVPN interactively
$ protonvpn-cli connect
Connect to ProtonVPN using the fastest server available
$ protonvpn-cli connect --fastest
Connect to ProtonVPN using a specific server with a specific protocol
$ protonvpn-cli connect [server_name] --protocol [udp|tcp]
Connect to ProtonVPN using a random server with a specific protocol
$ protonvpn-cli connect --random --protocol [udp|tcp]
Connect to ProtonVPN using the fastest Tor-supporting server
$ protonvpn-cli connect --tor
Display help
$ protonvpn-cli connect --help