1、SHELL编程For语句案例实战
1）For语句固定的语法格式：
For i in (表达式) do 动作1 done
2）For语句案例操作一：
#!/bin/bash for NUM in 1 2 3 4 do echo “$NUM) www.jd.com” done
3）For语句案例操作二：
#!/bin/bash for NUM in $(echo {1..4}) do echo “$NUM) www.jd.com” done
4）For语句案例操作三：
#!/bin/bash COMMAND="$*"for IP in 127.0.0.{1..10} do echo -e " 33[32mThe $IP Exec Command: 33[0m" ssh -l root $IP "$COMMAND" scp -r jfedu.txt root@$IP:/data/backup/ done
5）For语句案例操作四：
#!/bin/bash for LOG in `ls access_2019*` do echo $LOG tar -czvf ${LOG}.tar.gz $LOG if [ ! -d /data/backup/`date +%F` ];then mkdir -p /data/backup/`date +%F` fi mv ${LOG}.tar.gz /data/backup/`date +%F` rm -rf $LOG done
6）For语句案例操作五：
#!/bin/bash for LOG in `ls /data/backup/2019-07-06/*` doecho $LOG tar -xzf $LOG -C /data/logs/linux_web/ done
7）For循环打印10秒等待提示：
for ((j=0;j<=10;j++)) do echo -ne " 33[32m- 33[0m" sleep 1 done echo
2、SHELL编程While语句案例实战
1）While语句固定的语法格式：
While (表达式|条件) do 动作1 done
（1） 循环打印BAT企业官网，read指令用于读取行或者读取变量：
#!/bin/bash #By author jfedu.net 2017 while read LINE do echo $LINEdone <jfedu.txt
其中jfedu.txt内容为:
www.baidu.com
www.taobao.com
www.qq.com
（2） While无限每秒输出Hello World：
#!/bin/bash #By author jfedu.net 2017 while sleep 1 do echo -e " 33[32mHello World. 33[0m" done
（3） 循环打印1至100数字，expr用于运算逻辑工具：
#!/bin/bash #By author jfedu.net 2017 i=0 while ((i<=100)) do echo $i i=`expr $i + 1` done
（4） While循环求1-100的总和：#!/bin/bash
#By author jfedu.net 2017 #auto sum 1 100 j=0 i=1 while ((i<=100)) do j=`expr $i + $j` ((i++)) done echo $j
（5） While循环逐行读取文件：
#!/bin/bash #By author jfedu.net 2017 while read line do echo $line; done < /etc/hosts
（6） While循环判断输入数字是否大于100（IP正确性类似的），如果小于一
直提示其输入，直到正确为止：
#!/bin/bash while truedo read -p "Please input A Number:" INPUT if [ "$INPUT" -gt 100 ];then echo $INPUT break; fi done
（7） 每5秒循环判断/etc/passwd是否被非法修改：
#!/bin/bash #Check File to change. #By author jfedu.net 2017 FILES="/etc/passwd" while true do echo "The Time is `date +%F-%T`" OLD=`md5sum $FILES|cut -d" " -f 1` sleep 5 NEW=`md5sum $FILES|cut -d" " -f 1` if [[ $OLD != $NEW ]];then echo "The $FILES has been modified." fi done
（8） 每10秒判断jfedu用户是否登录系统：
#!/bin/bash while true do USER=$* echo -e " 33[32m`date` 33[0m" for i in $USER do NUM=$(who|grep $i|wc -l) if [ $NUM -ne 0 ];then echo "The $i is Login Linux System." fi done echo "--------------------" sleep 10 done
3、SHELL编程实战MYSQL数据库备份脚本
备份脚本实现任意单个库的备份；
#!/bin/bash #2019年7月6日15:54:03 #auto backup mysql database. #by author www.jfedu.net#################### SQL_USR="backup" SQL_PWD="backup" SQL_DB="$1" SQL_DIR="/data/backup/$(date +%F)" SQL_CMD="/usr/bin/mysqldump" if [ $# -eq 0 -o "$1" == "help" ];then echo -e " 33[32m---------------- 33[0m" echo -e " 33[32mUsage:{/bin/bash $0 jfedu1|www|jfedu2|help}033[0m" exit 1 fi if [ ! -d $SQL_DIR ];then mkdir -p $SQL_DIR fi $SQL_CMD -u$SQL_USR -p$SQL_PWD $SQL_DB > $SQL_DIR/${SQL_DB}.sql if [ $? -eq 0 ];then echo -e " 33[32mThe MYSQL $SQL_DB backup success.033[0m" echo "----------------" echo "ls -l $SQL_DIR/"ls -l $SQL_DIR/ else rm -rf $SQL_DIR/${SQL_DB}.sql echo -e " 33[32mThe MYSQL $SQL_DB backup Failed.033[0m" exit fi
备份脚本实现任意多个库备份；
#!/bin/bash #2019年7月6日15:54:03 #auto backup mysql database. #by author www.jfedu.net #################### SQL_USR="backup" SQL_PWD="backup" SQL_DB="$*" SQL_DIR="/data/backup/$(date +%F)" SQL_CMD="/usr/bin/mysqldump" if [ $# -eq 0 -o "$1" == "help" ];then echo -e " 33[32m---------------- 33[0m" echo -e " 33[32mUsage:{/bin/bash $0 jfedu1|www|jfedu2|help}033[0m"exit 1 fi if [ ! -d $SQL_DIR ];then mkdir -p $SQL_DIR fi for SQL_DB in `echo $SQL_DB` do $SQL_CMD -u$SQL_USR -p$SQL_PWD $SQL_DB > $SQL_DIR/${SQL_DB}.sql if [ $? -eq 0 ];then echo -e " 33[32mThe MYSQL $SQL_DB backup success.033[0m" echo "----------------" echo "ls -l $SQL_DIR/" ls -l $SQL_DIR/ else rm -rf $SQL_DIR/${SQL_DB}.sql echo -e " 33[32mThe MYSQL $SQL_DB backup Failed.033[0m" exit fi done
备份脚本实现所有数据库的备份；
#!/bin/bash #2019年7月6日15:54:03 #auto backup mysql database. #by author www.jfedu.net ######################### SQL_USR="backup" SQL_PWD="backup" SQL_DB="$*" SQL_DIR="/data/backup/$(date +%F)" SQL_CMD="/usr/bin/mysqldump" if [ $# -eq 0 -o "$1" == "help" ];then echo -e " 33[32m---------------- 33[0m" echo -e " 33[32mUsage:{/bin/bash $0 jfedu1|www|jfedu2|help}033[0m" exit 1 fi if [ ! -d $SQL_DIR ];then mkdir -p $SQL_DIR fi for SQL_DB in `echo $SQL_DB`do if [ "$SQL_DB" == "all" ];then $SQL_CMD -u$SQL_USR -p$SQL_PWD --all-databases > $SQL_DIR/${SQL_DB}.sql if [ $? -eq 0 ];then echo -e " 33[32mThe MYSQL $SQL_DB backup success.033[0m" echo "----------------" echo "ls -l $SQL_DIR/" ls -l $SQL_DIR/ continue else rm -rf $SQL_DIR/${SQL_DB}.sql echo -e " 33[32mThe MYSQL $SQL_DB backup Failed.033[0m" exit fi fi $SQL_CMD -u$SQL_USR -p$SQL_PWD $SQL_DB > $SQL_DIR/${SQL_DB}.sql if [ $? -eq 0 ];then echo -e " 33[32mThe MYSQL $SQL_DB backupsuccess. 33[0m" echo "----------------" echo "ls -l $SQL_DIR/" ls -l $SQL_DIR/ else rm -rf $SQL_DIR/${SQL_DB}.sql echo -e " 33[32mThe MYSQL $SQL_DB backup Failed.033[0m" exit fi done
4、SHELL编程实战Linux系统IP修改脚本
能够将动态IP修改为静态IP；
#!/bin/bash #2019年7月6日16:51:27 #auto change server ip. #by author www.jfedu.net #################### ETH_IPADDR="$1" GATEWAY="10.10.10.1" DNS_SERVER="8.8.8.8"ETH_NAME="ifcfg-ens33" NETMASK="255.255.255.0" ETH_BAK="/data/backup/`date +%F`" ETH_DIR="/etc/sysconfig/network-scripts" if [ $# -eq 0 ];then echo -e " 33[32m--------------- 33[0m" echo -e " 33[32mUsage:{/bin/bash $0 10.10.10.111|1.1.1.1|help}033[0m" exit 1 fi if [ ! -d $ETH_BAK ];then mkdir -p $ETH_BAK fi cd $ETH_DIR cp $ETH_NAME $ETH_BAK grep "dhcp" $ETH_NAME if [ $? -eq 0 ];then echo "TYPE="Ethernet" BOOTPROTO="static" NAME="ens33" DEVICE="ens33" ONBOOT="yes"">$ETH_NAMEecho "IPADDR=$ETH_IPADDR" >>$ETH_NAME echo "NETMASK=$NETMASK" >>$ETH_NAME echo "GATEWAY=$GATEWAY" >>$ETH_NAME echo "DNS1=$DNS_SERVER" >>$ETH_NAME fi
能够实现本身静态IP，修改为其他静态IP；
#!/bin/bash #2019年7月6日16:51:27 #auto change server ip. #by author www.jfedu.net #################### ETH_IPADDR="$1" GATEWAY="10.10.10.1" DNS_SERVER="8.8.8.8" ETH_NAME="ifcfg-ens33" NETMASK="255.255.255.0" ETH_BAK="/data/backup/`date +%F`" ETH_DIR="/etc/sysconfig/network-scripts" if [ $# -eq 0 ];then echo -e " 33[32m--------------- 33[0m" echo -e " 33[32mUsage:{/bin/bash $0 10.10.10.111|1.1.1.1|help}033[0m"exit 1 fi if [ ! -d $ETH_BAK ];then mkdir -p $ETH_BAK fi cd $ETH_DIR cp $ETH_NAME $ETH_BAK echo "TYPE="Ethernet" BOOTPROTO="static" NAME="ens33" DEVICE="ens33" ONBOOT="yes"">$ETH_NAME echo "IPADDR=$ETH_IPADDR" >>$ETH_NAME echo "NETMASK=$NETMASK" >>$ETH_NAME echo "GATEWAY=$GATEWAY" >>$ETH_NAME echo "DNS1=$DNS_SERVER" >>$ETH_NAME
判断用户输入的IP是否正确；
#!/bin/bash #2019年7月6日16:51:27 #auto change server ip. #by author www.jfedu.net ####################GATEWAY="10.10.10.1" DNS_SERVER="8.8.8.8" ETH_NAME="ifcfg-ens33" NETMASK="255.255.255.0" ETH_BAK="/data/backup/`date +%F`" ETH_DIR="/etc/sysconfig/network-scripts" if [ ! -d $ETH_BAK ];then mkdir -p $ETH_BAK fi while true do read -p "Please Input Server IPaddr: " ETH_IPADDR if [ ! -z $ETH_IPADDR ];then IP1=`echo $ETH_IPADDR|cut -d "." -f 1` IP2=`echo $ETH_IPADDR|cut -d "." -f 2` IP3=`echo $ETH_IPADDR|cut -d "." -f 3` IP4=`echo $ETH_IPADDR|cut -d "." -f 4` if [ $IP1 -ge 1 -a $IP1 -le 255 -a $IP2 -ge 0 -a $IP2 -le 255 -a $IP3 -ge 0 -a $IP3 -le 255 -a $IP4 -ge 0 -a $IP1 -le 255 ];then ETH_IPADDR=$ETH_IPADDR break fifi done cd $ETH_DIR cp $ETH_NAME $ETH_BAK echo "TYPE="Ethernet" BOOTPROTO="static" NAME="ens33" DEVICE="ens33" ONBOOT="yes"">$ETH_NAME echo "IPADDR=$ETH_IPADDR" >>$ETH_NAME echo "NETMASK=$NETMASK" >>$ETH_NAME echo "GATEWAY=$GATEWAY" >>$ETH_NAME echo "DNS1=$DNS_SERVER" >>$ETH_NAME if [ $? -eq 0 ];then echo echo "cat $ETH_DIR/$ETH_NAME" cat $ETH_DIR/$ETH_NAME echo "----------------" echo -e " 33[32mThe Server IPaddr config success. 33[0m" else echo echo -e " 33[32mThe Server IPaddr config Failed. 33[0m"exit fi