一、语法

select 变量 in con1 con2 con3    # 自动列出 con1，con2，con3 的选择菜单do    #执行内容break    # select本身就是一个循环，break是当选择后，就跳出循环done

二、练习

1. select + case 模拟 Linux 启动脚本
   

   function programstatus(){  if [ "$1" -eq 0 ]; then    echo "* program is running"  else    echo "* program has stopped"  fi}status=0 #0: start; 1:stopselect p in "start" "stop" "status" "restart" "*" ""docase "$p" in"start")  status=0  programstatus $status  ;;"stop")  status=1  programstatus $status  ;;"status")  programstatus $status  ;;"restart")  if [ "$status" -eq 0 ]; then    status=1    echo "* program has stopped"  fi  status=0  echo "* program is running"  ;;"")  break  ;;*)  echo "Plz input [start|stop|status|restart]"   ;;esacdone

   user@ae01:~$ ./test.sh1) start2) stop3) status4) restart5)#? 1* program is running#? 2* program has stopped#? 3* program has stopped#? 4* program is running#? 5user@ae01:~$

    

Shell 编程基础之 Select 练习