max=0
while [ `cat recv|wc -l` -ne 0 ]
do
while [ `cat send|wc -l ` -eq 0 ]
do
sleep 1
done
s1=`head -n 1 send`
sed -i "1d" send
r1=`head -n 1 recv`
sed -i "1d" recv
echo "$s1----$r1"
echo "1" >> max && sleep 4 && echo -e "$s1\n$r1" >>send && sed -i '1d' max &
while [ `cat max|wc -l` -gt 1 ]
do
sleep 1
done
done
