Terminate the connection that is running in the background

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>

killall -SIGINT openconnect

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