shell menu

echo  "输入您的选择";
echo  "1:显示您的主机名";
echo  "2:显示时间";
echo  "3:显示日历";
echo  "4:显示累加值";
echo  "5:显示平方值";
read choice;
 


case "$choice" in
  [1] )
    echo "您的主机名字是：";
    echo $HOSTNAME;;


 [2] )
    echo  “显示 时间”;
    date;;
  [3] )
    echo   "显示日期";
    cal;;
  [4])
    echo  "输入您的 N值";
    read N


    echo "显示累加1----$N  的值";


    sum=0;
    for((i=0;i<=N;i++))
    do
     sum=$[$i+$sum]
    done
    echo "1+2+...+$N的和是 $sum";;
    
   [5])
    echo  "显示1---10的平方";
    sum=0
    i=1
    until [ $i -gt 10  ]
    do
    sum=$[$i*$i]
    echo "$i * $i is $sum"
    i=$[$i+1]
    done   ;;
    #echo $sum
    *) echo "重新输入";;
 esac