with help of google , script that measures multicast streams bandwidth.

Here it is
 `tcpdump -tnn -i eth1 -f multicast | sort | uniq -c | awk '{print $3,"> "$5,$1*$NF/2*8/1024 " Kbps"}' | awk '$1 > 10' & sleep 2s && pkill -HUP -f tcpdump`

It turns out fine, except I need to hit enter to get back to prompt.
 I know it is && problem, but dont know how to fix it.

How can I trascribe it to shell script. And maybe add $var for number of seconds.