shell脚本练习

1、通过两个文件passwd     username建立用户：

#!/bin/bash USERNUM=$(wc -l /jiaoben/username | cut -d " " -f 1) PASSNUM=$(wc -l /jiaoben/password | cut -d " " -f 1) UNUM=$(wc -l /etc/passwd | cut -d " " -f 1) count=0 if [ $USERNUM -le $PASSNUM ] then     for NUM in $(seq 1 $USERNUM)     do             USER=`sed-n ${NUM}p /jiaoben/username`             PASSWD=`sed-n ${NUM}p /jiaoben/password`         id $USER &> /dev/null         if [ "$?" ="0" ]         then                 echo"${USER}已经存在"         else             useradd $USER -p $PASSWD&> /dev/null                        count=$((count+1))         fi     done else     for NUM in $(seq 1 $PASSNUM)         do         USER=`sed -n ${NUM}p/jiaoben/username`                 PASSWD=`sed -n ${NUM}p/jiaoben/password`                 id $USER &>/dev/null                 if [ "$?" ="0" ]                 then                         echo "${USER}已经存在"                 else                         useradd $USER -p$PASSWD &> /dev/null             count=$((count+1))                 fi         done fi echo  "共建立了${count}个用户"  

2.自动备份数据库：

#!/bin/bash read -p "请输入要登陆的用户名:" USER read -p "请输入登陆密码:" -s PASSWD mysql -u$USER -p$PASSWD -e "SHOW DATABASES;" &>/dev/null if [ "$?" != "0" ] then     echo -e "\n您输入的用户名或密码有误。"     exit else        mysql -u$USER -p$PASSWD -e "SHOWDATABASES;"     read -p "请输入要备份的数据库:"  DBNAME     read -p "请输入要备份的路径（/XXX/XXX.sql）:"  PP   mysqldump -u$USER -p$PASSWD $DBNAME > $PP fi if [ "$?" = "0" ] then     echo "备份完成。" else     echo "备份失败。" fi  

3.自动ssh连接：

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ssh.sh:

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#!/bin/bash read -p "Please input ip:" IP read -p "Please input user:" USER read -p "Please input password:" PASSWD ssh $USER@$IP  

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ssh.exp:

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#!/usr/bin/expect set IP [ lindex $argv 0 ] set USER [ lindex $argv 1 ] set PASSWD [ lindex $argv 2 ] spawn ./ssh.sh expect {      "continue connecting(yes/no)?"         {   send"yes\n";             exp_continue         }      "ip:"         {   send"$IP\n";             exp_continue         }      "user:"         {             send"$USER\n";             exp_continue         }      "password:"         {   send"$PASSWD\n";             exp_continue         } expect eof } interact  

4.ddns花生壳服务器自动配置（有yum源镜像）

#!/bin/bash yum install bind -y systemctl start named ###修改防火墙 firewall-cmd --permanent --add-service=dns firewall-cmd --reload rm -fr Kwestos.* ##生成密钥名字为westos dnssec-keygen -a HMAC-MD5 -b 128 -n HOST westos KEY=`sed -n 1p Kwestos.*.key | cut -d " " -f 7` ##修改dns配置文件 ############################# sed s/127.0.0.1/any/ /etc/named.conf -i sed s/localhost/any/ /etc/named.conf -i cat >> /etc/named.conf <<END key "westos" {                    algorithm hmac-md5;             secret"$KEY";              }; END ############################### ##配置正向解析文件 westoslinux.com.zone ################################################## cat > /var/named/westoslinux.com.zone <<END \$TTL 1D @       IN SOA   dns.westoslinux.com. root.westoslinux.com.(                                             0       ; serial                                            1D      ; refresh                                            1H      ; retry                                            1W      ; expire                                             3H )    ; minimum                 NS      dns.westoslinux.com. dns             A       172.25.254.112 www             A       172.25.254.222 END ############################################# ##配置named.rfc1912.zones ############################################### cat >> /etc/named.rfc1912.zones <<END zone "westoslinux.com" IN {                  type master;                  file"westoslinux.com.zone";                  allow-update { keywestos; };                  allow-transfer {172.25.254.212;};                  also-notify     {172.25.254.212;};                   }; END ############################################### setsebool -P named_write_master_zones 1 chmod 770 /var/named systemctl restart named yum install dhcp -y &> /dev/null ##修改dhcp配置文件 ########################################### cat > /etc/dhcp/dhcpd.conf <<END option domain-name "westoslinux.com"; option domain-name-servers 172.25.254.212; default-lease-time 600; max-lease-time 7200; ddns-update-style interim; log-facility local7; subnet 172.25.254.0 netmask 255.255.255.0 {   range 172.25.254.13172.25.254.99;   option routers 172.25.254.212; } key westos {         algorithm hmac-md5;         secret "$KEY"; }; zone westoslinux.com. {     primary 127.0.0.1;     key westos; } END ########################################### systemctl restart dhcpd