working version, for release

src/ssh-backdoor-open

@@ -31,13 +31,13 @@ USER=$( id -u -n )
 echo use of ssh-add is encouraged
 ( sleep 3; printf "%d\r" $SECONDS ) &
 while true; do
-    port=$( _ssh bin/ssh-backdoor $USER@$HOSTNAME )
+    port=$( _ssh bin/ssh-backdoor open $USER@$HOSTNAME )
     [[ -z "$port" ]] && { sleep 2; continue; }
     echo "$port port assigned"
     #~ _ssh pkill -a -f $USER@$HOSTNAME
     _ssh \
        -R $port:localhost:22 \
-       bin/ssh-backdoor -w $USER@$HOSTNAME || {
+       bin/ssh-backdoor keep $USER@$HOSTNAME || {
       true
          # failed
       #_ssh bin/ssh-kill $USER@$HOSTNAME $port || true