1
guys。我一般是Linux和shell脚本的新手,我有一个问题。计算计算操作并将它们从shell脚本写入文件
我有以下简单的计算器:
input="yes"
while [[ $input = "yes" ]]
do
PS3="Press 1 for Addition, 2 for subtraction, 3 for multiplication and 4 for division: "
select math in Addition Subtraction Multiplication Division
do
case "$math" in
Addition)
echo "Enter first no:"
read num1
echo "Enter second no:"
read num2
result=`expr $num1 + $num2`
COUNTER=COUNTER+1
echo Answer: $result
break
;;
Subtraction)
echo "Enter first no:"
read num1
echo "Enter second no:"
read num2
result=`expr $num1 - $num2`
echo Answer: $result
break
;;
Multiplication)
echo "Enter first no:"
read num1
echo "Enter second no:"
read num2
result=`expr $num1 * $num2`
echo Answer: $result
break
;;
Division)
echo "Enter first no:"
read num1
echo "Enter second no:"
read num2
result=$(expr "scale=2; $num1/$num2" | bc)
echo Answer = $result
break
;;
*)
echo Choose 1 to 4 only!!!!
break
;;
esac
done
done
所有我想要的是能够计数操作(意思是对于全成操作为+1,像“2 + 5 = 7”和一些计数器变量变为+1 ..然后是别的,再次+1)直到用户输入一些东西来停止计算器。然后,计数器变量(保存所执行操作的总数)应写入新文件中。我该怎么做,或者有人能给我一个例子?
所以,当我走出while循环我需要写'printf的“ %d \ n“”$ count“> file'?你能给我一个例子如何摆脱while循环吗? – Calihog
当用户选择除了1到4以外的选项时,您已经拥有了跳出循环的逻辑。如果这是您想要的,则可以在循环后放置printf。 – codeforester
不,当用户输入1-4之外的东西时,会要求他再次输入。 :) – Calihog