Question

I have a korn 88 shell script which creates a folder on the remote host using the following command:

ssh $user@$host "mkdir -p $somedir" 2>> $Log

and after that transfers a bunch of files in a loop using this

scp -o keepalive=yes $somedir/$file $user@$host:$somedir

I wonder if first command will leave connection open after script ends?

Answer 1

Each of the commands opens and closes its own connection. It’s easy to use a tool like tcpdump to verify this.

This is a consequence of the fact that the exit() system call used to terminate a process closes all open file descriptors including socket file descriptors. Closing a socket closes the connection behind the socket.