计算程序执行时间linux shell版

#/bin/bash

servername=server
file_name=Log.log

echo start testing $(date +%F.%T) > $file_name

for i in {1..10};do

    #server start

    startime=$(date +%s.%N)
    start_time1=$(date +%F.%T)

    #iSMsvr start cmd

    server start

    

    while [ 1 ]

    do

        id=$(ps -e | grep $servername|awk '{print $1}')

    if [ ! $id ];then

       ehco "waiting start"

    else

      break

    fi

    done

    

    endtime=$(date +%s.%N)

    cost_time1=`echo $endtime - $startime | bc`

    echo "staring $i time serverid = $id  starting time = $cost_time1"

      

    sleep 1

    #server stop

    startime=$(date +%s.%N)

    start_time2=$(date +%F.%T)

    server stop

    

    while [ 1 ]

    do

        id=$(ps -e | grep $servername |awk '{print $1}')

    if [ ! $id ];then

       break

    fi

    done

    

    endtime=$(date +%s.%N)

    cost_time2=`echo $endtime - $startime | bc`

    echo "stoping time = $cost_time2"

echo starting_time=$start_time1 runtime=$cost_time1 stoping time=$start_time2 runtime=$cost_time2 >> $file_name

sleep 1

if [ $[`expr $i % 5`] -eq 1 ]; then
   echo "     " >> $file_name
fi

done