Connect to a server and authenticate with a specific SSL client certificate

A VPN client, for Cisco AnyConnect VPNs and others.
More information: <https://www.infradead.org/openconnect/manual.html>.
Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

openconnect --certificate={{path/to/file}} {{vpn.example.org}}

click the source code to copy install openconnect on any operating system with command-not-found.com