将一文件某一列乘以2

#!/bin/bash

echo ""> ./config_singer_task.xml.bak

cat ./config_singer_task.xml | while read line

do

    #echo $line

    line2=`echo $line|grep LuckyCollectDesc|grep SingerGrowthAward`

    if [ "$line2" = "" ];then

        echo $line

        echo "$line" >> ./config_singer_task.xml.bak

    else

        grow=`echo $line2|awk -F '"' '{print $2}'` #第二列

        grow2=$(($grow*2))     第二列乘以2

        echo $grow " " $grow2

        line3=`echo ${line2/$grow/$grow2}`

        echo $line2

        echo $line3

        echo "$line3" >> ./config_singer_task.xml.bak

    fi

done