③.shell流程控制语句case

语法：

case vars in
     deployment)
      命令 ;;
     rollback)
      命令;;
     quit)
      命令;;
esac

多选项输入选择

#!/bin/bash
cat <<EOF
------------
 1.copy    -
 2.backup  -
 3.exit    -
------------
EOF
read -p "please input num: " vars
case $vars in 
      1|copy|COPY)
      echo 1 ;;
      2|backup|BACKUP)
      echo 2 ;;
      3|exit|EXIT)
      echo 3 ;;
      *)
      echo "Usage: ${0} input 1/2/3: " 
      exit
esac

1)nginx启动停止脚本

#!/bin/bash
if [ -f /tmp/nginx.lock ];then
    echo "$0 scripts is running" && exit
fi
touch /tmp/nginx.lock
source /etc/init.d/functions
rc=$1
Start_nginx() {
  if [ -f /var/run/nginx.pid -a -n /var/run/nginx.pid ];then
        echo "nginx is running!"
  else
         /usr/local/bin/nginx 
         action "nginx服务启动成功..." /bin/true   
  fi
}
Stop_nginx() {
 if [ -f /var/run/nginx.pid ];then
      /usr/local/bin/nginx  -s stop
      if [ $? -eq 0 ];then
           action "nginx服务关闭成功！" /bin/true
      else
           action 'nginx 关闭失败！'  /bin/false
      fi
else
      action  "nginx未运行！"   /bin/false   
fi
}
Reload_nginx() {
   if [ -f /var/run/nginx.pid -a -n /var/run/nginx.pid ];then
          sleep 30s
          /usr/local/bin/nginx -s reload
          if [ $? -eq 0 ];then
           action "nginx服务重载成功！" /bin/true
          else
           action "nginx服务重载失败！" /bin/false
          fi
   else
       echo "nginx未运行！"
   fi
}
Status_nginx() {
    if [ -f /var/run/nginx.pid ];then
         nginx_pid=$(cat /var/run/nginx.pid)
         if  [ -n $nginx_pid ];then
              echo "nginx is running ($nginx_pid)"
         else
              echo "nginx not running!"
         fi
    else 
        echo "nginx is not running!"
    fi
}

case $rc in 
     start)
        Start_nginx ;;
     stop)
        Stop_nginx  ;;
     reload)
        Reload_nginx  ;;
     status)
      Status_nginx   ;; 
     *)
         echo -e "33[31m USAGE: $0 please input {start|stop|reload}:  33[0m"
esac
rm -rf /tmp/nginx.lock

安装postgresql脚本

#!/bin/bash
while true
do
Check_OS() {
if grep -qs "CentOS" /etc/os-release;then
     if grep -qs "CentOS-7" /etc/os-release; then
             OS="centos"
             OS_Version="7"
     else
         echo  'Looks like you aren running this installer on CentOS7!' && exit
     fi
elif grep -qs "Ubuntu" /etc/os-release;then
    if grep -qs "18.04" /etc/os-release; then
	   OS="ubuntu"
           OS_Version="18.04"
    else 
            echo  'Looks like you aren running this installer on Ubuntu18.04!' && exit
    fi
else 
    echo  'Looks like you aren running this installer on Ubuntu18.04 or CentOS7!' && exit
fi
}

Install_PG() {
if [ ${OS} == "centos" ];then
          yum install -y https://download.postgresql.org/pub/repos/yum/reporpms/EL-${OS_Version}-x86_64/pgdg-redhat-repo-latest.noarch.rpm
          yum install -y postgresql${PG_Version}-server
          /usr/pgsql-${PG_Version}/bin/postgresql-${PG_Version}-setup initdb
          sed  -i "s##listen_addresses = 'localhost'#listen_addresses = '*'#g" /var/lib/pgsql/${PG_Version}/data/postgresql.conf
          systemctl enable postgresql-${PG_Version}
          systemctl start  postgresql-${PG_Version}
          su - postgres -c "psql -c "alter user postgres with password 'rongbiz' ;""
          wget -O /var/lib/pgsql/${PG_Version}/data/pg_hba.conf http://software.yangyijing.cn/postgresql/${OS}${OS_Version}/pg_hba.conf
          chown postgres.postgres /var/lib/pgsql/${PG_Version}/data/pg_hba.conf
          systemctl restart  postgresql-${PG_Version}
          echo "InStall Postgresql-${PG_Version} Is Ok"
elif [ ${OS} == "ubuntu" ];then
          sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list'
          wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
          apt-get update -y
          apt-get -y install postgresql-${PG_Version}
          su - postgres -c "psql -c "alter user postgres with password 'rongbiz' ;""
          sed  -i "s##listen_addresses = 'localhost'#listen_addresses = '*'#g" /etc/postgresql/${PG_Version}/main/postgresql.conf
          wget -O /etc/postgresql/${PG_Version}/main/pg_hba.conf http://software.yangyijing.cn/postgresql/${OS}${OS_Version}/pg_hba.conf
          chown postgres.postgres /etc/postgresql/${PG_Version}/main/pg_hba.conf
          systemctl restart postgresql
          echo "InStall Postgresql-${PG_Version} Is Ok"
fi
}

Remove_PG() {
docker ps|grep postgresql
if [ $? == 0 ];then
   docker rm -f postgresql && exit
fi
if [ $OS == "ubuntu" ];then
         rm -rf /etc/apt/sources.list.d/pgdg.list
         apt-get --purge remove -y postgresql*  
         apt && rm -rf /etc/postgresql /var/lib/postgresql ||rm -rf /var/lib/pgsql/
elif [ $OS == "centos" ];then
         yum remove pgdg-redhat-repo* -y
         yum remove postgresql* -y
         rm -rf /var/lib/pgsql/
fi
}

Main_menu() {
clear 
cat <<EOF
Please select the deployment mode!
    1) Localhost   Deployment(default)
    2) Docerk      Deployment
    3) Remove      Postgresql
    4) EXIT  
EOF
read -p "Deployment Mode: " Deployment_Mode
case "$Deployment_Mode" in
                1|"")
                Check_OS
                Deployment=L_Deployment ;;
                2)
                Deployment=D_Deployment ;;
                3)
                Check_OS
                Remove=Remove_PG        ;;
                4)
                 exit ;;
                *)
                echo "Input error ! " && exit
                ;;
        esac
}
Main_menu
 
Check_PG_Existing() {
     ss -nutlp|grep 5432
     if [ $? = 0 ]
     then 
           echo 'PostgreSql is existing! Please check!' && exit
     fi
    
}
Docker_Install_PG() {
dockcer -v >/dev/null || echo 'Please Install Docker Server!' && exit
ps -ef|grep -v grep |grep '/usr/bin/dockerd'
if  [ $? == 0 ];then
   echo 'Docker Server is not Running! Please Check!!' && exit
fi

  if [ -d /data/pgdata ]
   then
        echo '/data/pgdata dir existing' 
   else
        mkdir /data/pgdata/ -p
    fi
docker run -d --net host  --name=postgresql  -v /data/pgdata:/var/lib/postgresql/data  -e POSTGRES_PASSWORD=rongbiz rongshangtianxia/postgres:rstx_lot
}

Select_PG_Version() {
cat <<EOF
Please select the Postgresql Version !"
 1)  Postgresql 13 (default)
 2)  Postgresql 12
 3)  Postgresql 11
 4)  Previous menu 
EOF
read -p "Postgresql Version: " Postgresl_Version
case $Postgresl_Version in 
                1|"")
                PG_Version=13 ;;
                2)
                PG_Version=12 ;;
                3)
                PG_Version=11 ;;
                4)
                clear && Menu ;;
                *)
                echo "Input error !" && exit  ;;
esac
}
Menu() {
   Main_menu
   clear 
   Select_PG_Version
}

if [ "${Deployment}" == "L_Deployment" ];then 
       Check_PG_Existing
       clear
       Select_PG_Version
       Install_PG
elif [ "${Deployment}" == "D_Deployment" ];then 
       Check_PG_Existing
 
       Docker_Install_PG
elif [ "${Remove}" == "Remove_PG" ];then
        Remove_PG
fi
done