Boucle et récupération de PID

#! /bin/bash

arretTunnels(){
        echo 1 fois
        for pid in $( netstat -npt4 | grep ":22 " | grep "sshd: vnc" | cut -f2 -dD | cut -f1 -d/ | tr -d ' ' )
        do

                kill -9 $pid && echo arret pid OK

        done
}

while [ $x -eq 1 ]
do
        arretTunnels
        sleep 5
        netstat -npt4 | grep ":22 " | grep "sshd: vnc" && x="1" || x="0"
done

echo on quitte

line 13: [: -eq: unary operator expected