比较bash脚本中的数字 [英] Comparing numbers in bash scripting

问题描述

我写了这个脚本来比较bash中的2个数字，但是对于某些数字却给出了错误的答案.就像如果我给它2& 2作为输入，它给我"X大于Y"

I wrote this script to compare 2 numbers in bash but it gives me wrong answers for some numbers. like if I give it 2&2 for input , it gives me "X is greater than Y"

#!/bin/bash 
read num1
read num2
if [ $num1 > $num2 ]
    then 
        echo "X is greater than Y"
elif [ $num1 < $num2 ]
    then 
        echo "X is less than Y"
elif [ $num1 = $num2 ]
    then 
        echo "X is equal to Y"
fi 

推荐答案

您可以尝试使用bash算术上下文:

You can try with bash arithmetic contexts:

#!/bin/bash 
read num1
read num2
if (( num1 > num2 ))
    then 
        echo "X is greater than Y"
elif (( num1 < num2 ))
    then 
        echo "X is less than Y"
elif (( num1 == num2 ))
    then 
        echo "X is equal to Y"
fi 

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