（十）、shell编程实战

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1：配置文件解析脚本

#!/usr/bin/env bash

while read line
do
   name=`echo $line|awk -F'=' '{print $1}'`
   value=`echo $line|awk -F'=' '{print $2}'`
   echo "name is ${name},value is ${value}"
done<config.cfg

# 注：需先准备好config.cfg文件
ip=127.0.0.1
port=80
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注：<输入重定向，line变量从config.cfg文件中读取；``将内部数据当做一个命令执行

2：旧日志清理脚本

#!/bin/bash

while [ 1 ]
do
   fCount=$(ls -l|grep log$|wc -l)
   if [ $fCount -gt 9 ]
   then
      dFile=$(ls -ltr|grep log$|awk 'NR==1 {print $9}')
      echo "Delete file:$dFile"
      rm -rf $dFile
   else
      echo "File count<9"
   fi
   sleep 5
done
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创建脚本文件./clear_log.sh，执行时须在目录下创建.log文件

注：while [ 1 ]代表死循环；log$代表以log结尾；wc -l代表显示行数；-gt代表大于；-ltr代表l详细信息，t按时间排序最新的显示在最前面，r倒序；NR==1代表取第一天记录

3：创建大数据

#!/bin/bash
#Generate 1 Million user data which have three items: Phone number:ip address:email address

filename="User.txt"

if [ -e "$filename" ]
then
   echo "Clean up old file"
   rm -rf $filename
fi

phone_start="138"
ipv4_start="0x"
email_end="qq.com"

declare -i s_loop=11000001
declare -i ip_loop=0
declare -i e_loop=11001001

echo "Generate 1 Million data "
date

while [ $s_loop -lt $e_loop ]
do
   ip_loop=$(($s_loop + 20000000))
   echo "$phone_start$s_loop:$ipv4_start$s_loop:$phone_start$s_loop@$eamil_end">>$filename
   
   s_loop=$(($s_loop + 1))
done

echo $s_loop
date
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创建脚本文件./generate_data.sh

注：-e判断是否存在；-lt小于

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