start a remote interactive shell in the target device
usage: fx shell [-h|--help] [--check | [<ssh flags>] <command>]
Creates an SSH connection with a device and executes a command.
Arguments:
-h|--help Print out this message.
--check Diagnose SSH keys and show relevant information about SSH keys
and the target device and exit.
<ssh flags> Flags and command are passed to SSH as is. Consult SSH help
for a list of available flags.