LINUX 下的 shell 脚本——应用实例和项目

LINUX 下的 shell 脚本——应用实例和项目

1.实例一

用户建立脚本
执行 users_create.sh userlist passlist
建立 userlist 列表中的用户
设定 userlist 列表中的密码为 passlist 列表中的密码
当脚本后面跟的文件个数不足两时，报错
当文件行数不一致时报错
当文件不存在时报错
当用户存在时报错

10 #!/bin/bash
 11 ping -c 1 172.25.254.10 &> /dev/null
 12 [ $? -eq 0 ] && {
 13         echo "ping is ok"
 14 } ||{
 15         echo "ping is not ok"
 16         exit
 17 }
 18 [ `setenforce 0 &> /dev/null` -a `systemctl stop firewalld &> /dev/null`]
 19 [ $? -eq 0 ] && {
 20         echo "selinux and fierwall set success"
 21 }||{
 22         echo "selinux and firewalld set failed"
 23         exit
 24 }
 25 rpm -q nfs-utils &> /dev/null
 26 if [ $? -eq 0 ];then
 27         echo "nfs-server has installed"
 28 else
 29         echo "you should install nfs-server"
 30         dnf install nfs-utlis -y  &> /dev/null
 31         systemctl enable --now nfs-server &> /dev/null
 32         echo "nfs-server install success"
 33 fi
 34 read -p "please input a share dir:" dir
 35 if [ -e $dir ];then
 36         echo "share dir $dir exist"
 37 else
 38         mkdir $dir
 39         echo "share dir $dir create success"
 40 fi
 41 chmod 1777 $dir
 42 read -p "please input share ip range:" iprange
 43 read -p "please input permission(ro/rw):" permission
 44 read -p "input 1 -> clear config,defaults is add:" choice
 45 if [ $choice -eq 1 ];then
 46         > /etc/exports
 47 fi
 48 cat >> /etc/exports <<EOF
 49 $dir $iprange($permission)
 50 EOF
 51 systemctl restart  nfs-server | grep active &> /dev/null
 52 showmount -e 172.25.254.20 | grep $dir
 53 [ $? -eq 0 ] && echo "share success" || echo "share fail"
 54 echo "welcome for you next time"

运行结果：

2.实例2

shell脚本完成nfs网络系统的搭建

10 #!/bin/bash
 11 ping -c 1 172.25.254.10 &> /dev/null
 12 [ $? -eq 0 ] && {
 13         echo "ping is ok"
 14 } ||{
 15         echo "ping is not ok"
 16         exit
 17 }
 18 [ `setenforce 0 &> /dev/null` -a `systemctl stop firewalld &> /dev/null`]
 19 [ $? -eq 0 ] && {
 20         echo "selinux and fierwall set success"
 21 }||{
 22         echo "selinux and firewalld set failed"
 23         exit
 24 }
 25 rpm -q nfs-utils &> /dev/null
 26 if [ $? -eq 0 ];then
 27         echo "nfs-server has installed"
 28 else
 29         echo "you should install nfs-server"
 30         dnf install nfs-utlis -y  &> /dev/null
 31         systemctl enable --now nfs-server &> /dev/null
 32         echo "nfs-server install success"
 33 fi
 34 read -p "please input a share dir:" dir
 35 if [ -e $dir ];then
 36         echo "share dir $dir exist"
 37 else
 38         mkdir $dir
 39         echo "share dir $dir create success"
 40 fi
 41 chmod 1777 $dir
 42 read -p "please input share ip range:" iprange
 43 read -p "please input permission(ro/rw):" permission
 44 read -p "input 1 -> clear config,defaults is add:" choice
 45 if [ $choice -eq 1 ];then
 46         > /etc/exports
 47 fi
 48 cat >> /etc/exports <<EOF
 49 $dir $iprange($permission)
 50 EOF
 51 systemctl restart  nfs-server | grep active &> /dev/null
 52 showmount -e 172.25.254.20 | grep $dir
 53 [ $? -eq 0 ] && echo "share success" || echo "share fail"
 54 echo "welcome for you next time"

 

拓展用shell脚本搭建Samba服务器

 10 #!/bin/bash
 11  ping -c 1 172.25.254.20 &> /dev/null
 12   [ $? -eq 0 ] && {
 13           echo "ping is ok"
 14   } ||{
 15           echo "ping is not ok"
 16           exit
 17   }
 18 [ `setenforce 0 &> /dev/null` -a `systemctl stop firewalld &> /dev/null` ]
 19  [ $? -eq 0 ] && {
 20          echo "selinux and fierwall set success"
 21  }||{         echo "selinux and firewalld set failed"
 22         exit
 23  }
 24 rpm -q samba &> /dev/null
 25 if [ $? -eq 0 ];then
 26         echo "samba has installed"
 27 else
 28         echo "you should samba service"
 29         dnf install samba -y &> /dev/null
 30 fi
 31 rpm -q samba-common  &> /dev/null
 32 if [ $? -eq 0 ];then
 33         echo "samba-common has installed"
 34 else
 35         echo "you should samba-common"
 36         dnf install samba -y &> /dev/null
 37 fi
 38 rpm -q samba-client &> /dev/null
 39 if [ $? -eq 0 ];then
 40         echo "samba-client has installed"
 41 else
 42         echo "you should samba-client"
 43         dnf install samba -y &> /dev/null
 44 fi
 45 systemctl enable --now  smb &> /dev/null
 46 systemctl start smb &> /dev/null
 47 smbclient  -L //172.25.254.20
 48 echo "you can use samba"
 49 pdbedit -L &> /dev/null
 50 if [ $? = 0 ];then
 51         echo "smb user has: " 
 52         pdbedit -L | cut -d ":" -f 1
 53 else
 54         echo "you can add smb user:"
 55 fi
 56 smbclient  //172.25.254.20/`pdbedit -L | cut -d ":" -f 1` -U `pdbedit -L | cut -d ":" -f 1`

作业：

●判断/tmp/run目录是否存在，如果不存在就建立，如果存在就删除目录里所有文件

10 #!/bin/bash
 11 [ -e /tmp/run ]
 12 if [ $? -eq 0 ];then
 13         rm -fr /tmp/run/*
 14         echo "/tmp/run/ all file has remove"
 15 else
 16         mkdir /tmp/run
 17         echo "/tmp/run/ create success"
 18 
 19 fi

● 输入一个路径，判断路径是否存在，而且输出是文件还是目录，如果是链接文件，还得输出是 有
效的连接还是无效的连接

10 #!/bin/bash
 11 read -p "Please input a run:" run
 12 if [ -e $run ];then
 13         if [ -d $run ];then
 14                 echo "$run is dir"
 15         else
 16                 if [ -f $run -a -L $run ];then
 17                         echo "$run is valid link file"
 18                 else
 19                                 echo "$run is invalid link file"
 20                 fi
 21         fi
 22 fi

● 交互模式要求输入一个ip，然后脚本判断这个IP 对应的主机是否 能ping 通，输出结果类似于：
Server 10.1.1.20 is Down! 最后要求把结果邮件到本地管理员[e-mail]
[e-mail]

#!/bin/bash

read -p "Please input ip address:" ip

ping -c1 $ip &>/dev/null
if [ $? -eq 0 ];then
  echo "Server $ip is okey!" | mail -s "Server State" [e-mail]
else
  echo "Server $ip is down!" | mail -s "Server State" [e-mail] 
fi

● 写一个脚本/home/program，要求当给脚本输入参数hello时，脚本返回world,给脚本输入参数
world时，脚本返回hello。而脚本没有参数或者参数错误时，屏幕上输出
“usage:/home/program hello or world”

#!/bin/bash

if [ "$1" == "hello" ];then
  echo "world"
elif [ "$1" == "world" ];then
  echo "hello"
else
  echo "usage:/home/program hello or world"
fi

● 写一个脚本自动搭建nfs服务

#!/bin/bash

#name:auto_build_nfs_serve.sh
#path:/tmp/
#update: 2020-3-11

read -p "Please input Sever Address:" ip
#检测网络连接是否正常
ping -c1 $ip &>/dev/null && echo "Server connection is normal"

#第一步：关闭selinux和防火墙
#selinux是安全增强型 Linux（Security-Enhanced Linux）简称，是linux的一个安全子系统
#临时关闭Selinux: setenforce 0
#永久关闭：vim /etc/sysconfig/selinux
#SELINUX=enforcing 改为 SELINUX=disabled

setenforce 0 &>/dev/null  && echo "selinux has closed..."
systemctl stop firewall &>/dev/null && echo "Firewall has been closed ..."

#第二步：确认软件是否安装
#查询指定软件是否已安装：rpm -q <软件名> 或者 rpm -qa <软件名> 或者 rpm -qa | grep <软件名>
rpm -aq | grep rpcbind &>/dev/null
if [ $? -eq 0 ];then
    echo "rpcbind has been installed"
else 
    yum install rpcbind -y &>/dev/null && echo "Intalling the rpcbind..."
fi


#第三步:创建和发布共享目录
read -p "Please enter the directory you want to share:" dir
# 创建目录，-p 确保目录名称存在，不存在的就建一个。
mkdir $dir -p &>/dev/null
chmod 777 $dir
read -p "Please enter the network segment to be shared" NS
read -p "Please enter the permission to share, enter ro or rw:" PERMISSION
cat >> /etc/exports << end
$dir  $NS($PERMISSION)
end


#第四步：设置nfs服务开机自启动
systemctl restart rpcbind.service &>/dev/null && echo "rpcbind service has been started..."
systemctl restart nfs.service &>/dev/null && echo "nfs service started successfully"