Network manager CLI (nmcli) is a command-line tool for controlling NetworkManager and reporting network status.
I personally use it to connect / disconnect pre-configured VPNs
Here some useful commands
# Show connections
nmcli con show
# Connect
nmcli con up id "<name>"
# Disconnect
nmcli con down id "<name>"Assign static ip
# add a new connection name
nmcli con add con-name "<name>" ifname <device> type ethernet ip4 <ip>/24 gw4 <ip-gateway>
# assign dns comma separated
nmcli con mod "<name>" ipv4.dns "<ip1>,<ip2>"
# start the interface
nmcli con up "<name>"
# delete the old one if any
nmcli con del "<old-name>"
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