this is what i've done

who -u > IP
sleep 10000 ( 0% cpu )
who -u > IP2
diff IP IP2 > diff1
/usr/sbin/mailx helpdesk@rtt.co.za < /home/me/diff1

question ? how do i kick this off so that it runs in the back ground

do i just

cammand -D

would that be safe.