I found the instructions on kerneltrap's mail archive: "scp batch mode?" to be insightful an useful, however when I issue the command to close the connection
# Bring the connection down. ssh -S /tmp/ssh_socket -O exit dummy
my ssh complains that it does not support the
-O (that is upper case o) option.
My question is: Is it sufficient to delete the
/tmp/ssh_socket, to properly close the connection, or am I missing some important step here?