想測量傳輸效能，檔案傳輸完後程式不會結束，改用diff比對
使用time只能取到秒，改用date可以取到ns
#!/usr/bin/env bash
function waitTransfer()
{
while true
do
diff -r --binary --brief $1 $1_dest
if [ $? -eq 0 ]; then
break
fi
sleep 0.01
done
}
SIZE_TYPE='file1M file5M file50M'
for sizeType in $SIZE_TYPE
do
mkdir ${sizeType}_dest
echo 'Run --- ' $sizeType
begin=$(date +%s%N)
# do Something
waitTransfer $sizeType
end=$(date +%s%N)
elapsed=$((end - begin))
echo 'Done --- ' $sizeType
bc -l <<< "$elapsed / 1000000000"
echo "======================"
rm -rf ${sizeType}_dest
done
exit
