使用shell脚本简单模拟对特定文件同时读写操作

使用shell脚本简单模拟对特定文件同时读写操作
文件内容的格式：
field1    ,       field2    ， field3    ,       field4
以，为分隔符，但是存在空格。

• 脚本用法如下：

./check_write_read.sh 10

• 输出结果：

Thu Apr 27 19:59:44 CST 2017:Read operation finished
670
Thu Apr 27 19:59:44 CST 2017:Write operation finished
671
Thu Apr 27 19:59:46 CST 2017:Check Write OK
Thu Apr 27 19:59:56 CST 2017:Check Read OK

• 脚本内容：

if [[ $1 =~ ^[1-9] ]]; then
   timeInterval=$1
else
   echo "parameter error, should be number"
   exit 1
fi
timefrom_1=`date +%s`
timeto_1=`expr $timefrom_1 + $timeInterval`
timenow_1=$timefrom_1
count_1=0

timefrom_2=`date +%s`
timeto_2=`expr $timefrom_2 + $timeInterval`
timenow_2=$timefrom_2
count_2=0

function rand(){
    min=1
    max=292
    num=$(cat /dev/urandom | head -n 10 | cksum | awk -F ' ' '{print $1}')
    echo $(($num%$max+$min))
}

function checkWrite(){
 while read LINE
 do
    resultMsg=`cat configdata.cfg | grep $LINE`
    if [ -z "$resultMsg" -o "$resultMsg" == "" -o x"$resultMsg" == x ]; then
           echo "write error"
       echo "LINE:$LINE"
       echo "resultMsg:$resultMsg"
       exit 1
    fi
 done<result_write.txt
 echo "`date`:Check Write OK"
}

function checkRead(){
 while read LINE
 do
    linenumber=`echo $LINE | cut -d : -f1`
    linevalue=`echo $LINE | cut -d : -f2 | sed s/[[:space:]]//g`
    resultMsg=`sed -n "$linenumber,1p" configdata.cfg | awk -F ',' 'BEGIN{OFS=","}{print $1,$2}' | sed s/[[:space:]]//g`
    resultMsg=`sed -n "$linenumber,1p" configdata.cfg | cut -d , -f1,2 |sed s/[[:space:]]//g`
    if [ -z "$resultMsg" -o "$resultMsg" == "" -o x"$resultMsg" == x ]; then
            echo "read error,it's null"
        echo "linenumber:$linenumber"
        echo "linevalue:$linevalue"
        echo "resultmsg:$resultMsg"
        exit 1
    fi

    if [ "$resultMsg" != "$linevalue" ]; then
           echo "read error,value error"
       echo "resultMsg:$resultMsg"
       echo "linevalue:$linevalue"
       exit 1
    fi
    #echo "resultMsg:$resultMsg"
    #echo "linevalue:$linevalue"
 done<result_read.txt
 echo "`date`:Check Read OK"
}

#write operation
function writeOperation(){
   rm -f result_write.txt
   until [ "$timenow_1" == "$timeto_1" ]
   do
           rnd_1=$(cat /dev/urandom | head -n 10 | cksum | awk -F ' ' '{print $1}')
          echo "${rnd_1}">>result_write.txt
          echo "${rnd_1}">>configdata.cfg
          count_1=`expr $count_1 + 1`
           timenow_1=`date +%s`
   done
   echo "$count_1" | tee -a result_write.txt
   echo "`date`:Write operation finished"
}
#read action
function readOperation(){
   rm -f result_read.txt
   until [ "$timenow_2" == "$timeto_2" ]
   do
       rnd_2=`rand`
       line="${rnd_2}"":""`sed -n "$rnd_2,1p" configdata.cfg | cut -d , -f1,2`"
       echo $line>>result_read.txt
       timenow_2=`date +%s`
   done
   echo "`date`:Read operation finished"
}

{
   writeOperation
}&

{
   readOperation
}&

wait
#sleeptime=`expr $timeInterval + 2`
#sleep $sleeptime
cat result_write.txt | wc -l | tee
checkWrite
checkRead
exit 0