shell脚本模板

#!/bin/sh

. /etc/rc.d/init.d/functions
export LANG=zh_CN.UTF-8

#一级菜单
menu1()
{
clear
cat <<eof
----------------------------------------
|#         CentOS7.9优化脚本          #|
----------------------------------------

1. 一键优化
2. 自定义优化
3. 退出

EOF
read -p "please enter your choice[1-3]:" num1
}


#二级菜单
menu2()
{
 clear
 cat << eof
----------------------------------------
|#   Please Enter Your Choice:[0-9]   #|
----------------------------------------

1. 关闭selinux
2. 关闭firewalld

0.Back

EOF
 read -p "please enter your choice[0-9]:" num2

}

#1.关闭selinux
selinuxset()
{
 selinux_status=`grep "SELINUX=disabled" /etc/sysconfig/selinux | wc -l`
 echo "========================禁用SELINUX========================"
 if [ $selinux_status -eq 0 ];then
  sed  -i "s#SELINUX=enforcing#SELINUX=disabled#g" /etc/sysconfig/selinux
  setenforce 0
  echo '#grep SELINUX=disabled /etc/sysconfig/selinux'
  grep SELINUX=disabled /etc/sysconfig/selinux
  echo '#getenforce'
  getenforce
 else
  echo 'SELINUX already disabled'
  echo '#grep SELINUX=disabled /etc/sysconfig/selinux'
                grep SELINUX=disabled /etc/sysconfig/selinux
                echo '#getenforce'
                getenforce
 fi
  action "Disabled SELINUX" /bin/true
 echo "==========================================================="
 echo ''
 sleep 1
}

#2.关闭firewalld
firewalldset()
{
 echo "=======================禁用firewalld========================"
 systemctl stop firewalld.service &> /dev/null
 echo '#firewall-cmd  --state'
 firewall-cmd  --state
 systemctl disable firewalld.service &> /dev/null
 echo '#systemctl list-unit-files | grep firewalld'
 systemctl list-unit-files | grep firewalld
 action "Disable firewalld" /bin/true
 echo "==========================================================="
 echo ''
 sleep 1
}



#控制函数
main()
{
 menu1
 case $num1 in
  1)
   selinuxset
   firewalldset
   ;;
  2)
   menu2
   case $num2 in
                  1)
                    selinuxset
                    ;;
                  2)
                    firewalldset
                    ;;
                  0)
                    main
                    ;;
                  *)
                    echo 'Please select a number from [0-9].'
                    ;;
                  esac
                  ;;
  0)
   exit
   ;;
  *)
   echo 'Err:Please select a number from [1-3].'
   sleep 3
   main
   ;;
 esac
}

main $*