shell脚本修改配置文件指定行的值

配置文件内容为

<Data Count="6">
  <Line>
    <switch>
    </switch>
    <description>Version</description>
    <value>1</value>
  </Line>
  <Line>
    <switch>
    </switch>
    <description>ExpireTime</description>
    <value>300</value>
  </Line>
  <Line>
    <switch>
    </switch>
    <description>MaxProcessTime</description>
    <value>15</value>
  </Line>
  <Line>
    <switch>
    </switch>
    <description>MaxQueueSize</description>
    <value>2000</value>
  </Line>
  <Line>
    <switch>
    </switch>
    <description>MaxStatisticsTime</description>
    <value>1000000</value>
  </Line>
  <Line>
    <switch>
    </switch>
    <description>StatisticsCount</description>
    <value>10</value>
  </Line>
</Data>

根据关键字MaxStatisticsTime获取行号,修改对应的value值

change_file.sh

#!/bin/bash

file_name="config.xml"
key_value="MaxStatisticsTime"

changeFile()
{
    declare -i nline
    getline()
    {
        cat -n $file_name|grep "${key_value}"|awk '{print $1}'
    }
    getlinenum()
    {
        awk "BEGIN{a=`getline`;b="1";c=(a+b);print c}";
    }
    nline=`getlinenum`
    sed -i "${nline}s/>[^)]*</>$1</g" $file_name
}

changeFile 2000000

执行脚本后将1000000修改为2000000