cat > cau_speed.sh << 'EOF'
#!/bin/sh
sleep_time=10
while true
do
ci_pan_1=`du -s ./|awk '{print $1}'`
sleep $sleep_time
ci_pan_2=`du -s ./|awk '{print $1}'`
cha=$(expr $ci_pan_2 - $ci_pan_1)
zhao=$(expr $cha / 1024)
sudu=$(expr $zhao / $sleep_time)
dangqian=`du -sh`
echo "$sudu MB/s,当前大小:$dangqian"
done
EOF