monitor SSH status

monssh.sh

#! /bin/bash
# usage: monssh [hostname]

if [[ -z $1 ]]
then
    HOST="YOURHOST"
else
    HOST=$1
fi

CMD="ssh -fqND 9999 $HOST"

while true
do
    pgrep -fl "$CMD" > /dev/null 2>&1
    if [[ $? -eq 0 ]]
    then
        echo "[`date`] Status: OK."
    else
        echo "Status: launching $CMD"
        $CMD
    fi

    sleep 30
done