レスポンスタイム計測shellscript

response.sh

#!/bin/bash

if [ $# -ne 1 ]; then
  echo "usage: $0 {url}" 1>&2
  exit 1
fi

url=$1
rs1=curl -kL $url  -o /dev/null -w "%{time_total}" 2> /dev/null

sum=0
for i in `seq 1 10`
do
  rs=`curl -kL $url  -o /dev/null -w "%{time_total}" 2> /dev/null`
  echo $rs
  sum=`echo "scale=3;$sum+$rs" | bc`
done
echo avg `echo "scale=3;$sum/10" | bc`