Install jq with apt install jq
./rvsh (you can eventually add it as a symlink)
Options:
-connect:
hostname user
-admin: (login)
host
-a <hostname> or -r <hostname>
user <user> (nologin by default)
-a <hostname1 hostname2 ...>
-r <hostname ...>
wall msg or -n msg
Don't hesitate to use the command help to see commands and options specifically created