Shell 編程基礎之 Select 練習

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一、文法

select 變數 in con1 con2 con3    # 自動列出 con1，con2，con3 的選擇菜單do    #執行內容break    # select本身就是一個迴圈，break是當選擇後，就跳出迴圈done

二、練習

1. select + case 類比 Linux 啟動指令碼
   

   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

   [email protected]:~$ ./test.sh1) start2) stop3) status4) restart5)#? 1* program is running#? 2* program has stopped#? 3* program has stopped#? 4* program is running#? 5[email protected]:~$

    

Shell 編程基礎之 Select 練習