SHELL用法四（for语句）

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
 
do
echo “$NUM) www.jd.com”
done

3）For语句案例操作二：

#!/bin/bash
..})
do
echo “$NUM) www.jd.com”
done

4）For语句案例操作三：

#!/bin/bash
COMMAND=.{..}
do
echo -e "\033[32mThe $IP Exec Command:\033[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
--/*`
doecho $LOG
tar -xzf $LOG -C /data/logs/linux_web/
done

7）For循环打印10秒等待提示：

;j<=;j++))
do
echo -ne "\033[32m-\033[0m"
 
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
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 
 
do
echo -e "\033[32mHello World.\033[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
i=
))
do
echo $i
i=``
done

（4） While循环求1-100的总和：#!/bin/bash

#By author jfedu.net
#auto
j=
i=
))
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
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
 ];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
FILES="/etc/passwd"
while true
do
echo "The Time is `date +%F-%T`"
OLD=`md5sum $FILES|`
 
NEW=`md5sum $FILES|`
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 "\033[32m`date`\033[0m"
for i in $USER
do
NUM=$(who|grep $i|wc -l)
 ];then
echo "The $i is Login Linux System."
fi
done
echo "--------------------"
 
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::
#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"
 -o "$1" == "help" ];then
echo -e "\033[32m----------------\033[0m"
echo -e "\033[32mUsage:{/bin/bash $0
jfedu1|www|jfedu2|help}\[0m"
exit
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
 ];then
echo -e "\033[32mThe MYSQL $SQL_DB backup
success.\[0m"
echo "----------------"
echo "ls -l $SQL_DIR/"ls -l $SQL_DIR/
else
rm -rf $SQL_DIR/${SQL_DB}.sql
echo -e "\033[32mThe MYSQL $SQL_DB backup
Failed.\[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::
#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"
 -o "$1" == "help" ];then
echo -e "\033[32m----------------\033[0m"
echo -e "\033[32mUsage:{/bin/bash $0
jfedu1|www|jfedu2|help}\[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
 ];then
echo -e "\033[32mThe MYSQL $SQL_DB backup
success.\[0m"
echo "----------------"
echo "ls -l $SQL_DIR/"
ls -l $SQL_DIR/
else
rm -rf $SQL_DIR/${SQL_DB}.sql
echo -e "\033[32mThe MYSQL $SQL_DB backup
Failed.\[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::
#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"
 -o "$1" == "help" ];then
echo -e "\033[32m----------------\033[0m"
echo -e "\033[32mUsage:{/bin/bash $0
jfedu1|www|jfedu2|help}\[0m"
exit
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
 ];then
echo -e "\033[32mThe MYSQL $SQL_DB
backup success.\[0m"
echo "----------------"
echo "ls -l $SQL_DIR/"
ls -l $SQL_DIR/
continue
else
rm -rf $SQL_DIR/${SQL_DB}.sql
echo -e "\033[32mThe MYSQL $SQL_DB
backup Failed.\[0m"
exit
fi
fi
$SQL_CMD -u$SQL_USR -p$SQL_PWD $SQL_DB >
$SQL_DIR/${SQL_DB}.sql
 ];then
echo -e "\033[32mThe MYSQL $SQL_DB backupsuccess.\033[0m"
echo "----------------"
echo "ls -l $SQL_DIR/"
ls -l $SQL_DIR/
else
rm -rf $SQL_DIR/${SQL_DB}.sql
echo -e "\033[32mThe MYSQL $SQL_DB backup
Failed.\[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::
#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"
 ];then
echo -e "\033[32m---------------\033[0m"
echo -e "\033[32mUsage:{/bin/bash $0
[0m"
exit
fi
if [ ! -d $ETH_BAK ];then
mkdir -p $ETH_BAK
fi
cd $ETH_DIR
cp $ETH_NAME $ETH_BAK
grep "dhcp" $ETH_NAME
 ];then
echo "TYPE=\"Ethernet\"
BOOTPROTO=\"static\"
NAME=\"ens33\"
DEVICE=\"ens33\"
ONBOOT=\"yes\"">$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::
#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"
 ];then
echo -e "\033[32m---------------\033[0m"
echo -e "\033[32mUsage:{/bin/bash $0
[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::
#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=``
IP2=``
IP3=``
IP4=``
 -a $IP1 -le  -a $IP2 -ge  -a $IP2 -le  -a $IP3 -ge
-a $IP3 -le  -a $IP4 -ge  -a $IP1 -le  ];then
ETH_IPADDR=$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
 ];then
echo
echo "cat $ETH_DIR/$ETH_NAME"
cat $ETH_DIR/$ETH_NAME
echo "----------------"
echo -e "\033[32mThe Server IPaddr config success.\033[0m"
else
echo
echo -e "\033[32mThe Server IPaddr config Failed.\033[0m"exit
fi