This works for me using just the socket file for the control master:
$ ssh -o ControlPath=~/.ssh/-O check Example
Here's an example where I've already established a connection to a remote server:$ ssh -o ControlPath=~/.ssh/master-57db26a0499dfd881986e23a2e4dd5c5c63e26c2 -O check blah Master running (pid=89228)And with it disconnected:
$ ssh -o ControlPath=~/.ssh/master-66496a62823573e4760469df70e57ce4c15afd74 -O check blah Control socket connect(/Users/user1/.ssh/master-66496a62823573e4760469df70e57ce4c15afd74): No such file or directoryIf it were still connected, this would force it to exit immediately:
$ ssh -o ControlPath=~/.ssh/master-66496a62823573e4760469df70e57ce4c15afd74 -O exit blah Exit request sent.How to close (kill) ssh ControlMaster connections manually - Unix & Linux Stack Exchange
