Shell编程之if简单判断两个数字大小

Posted 2021-01-18 lin666-

#脚本编辑

---

 

#!/bin/bash

#定义变量

num1=$1
num2=$2

 

#判断是否输入两个参数，若是，将两个参数传递给下一个指令动作，若非两个参数，则打印输出内容输出并且退出exit脚本不执行下一个指令
if [ $# -ne 2 ] ;then
   echo ‘please input num1 & num2:‘
exit
fi

 

#以上判断后，输入的两个参数将传递到如下指令判断
if [ $num1 -gt $num2 ] ; then
   echo $num1 great than $num2

 

else if [ $num1 -lt $num2 ] ; then

   echo $num1 less than $num2

 

else
   echo $num1 equal $num2

 

fi  
fi

 

---

 

#验证是否正确

 

[[email protected] scripts]# sh compare2.sh 66

please input num1 & num2:

[[email protected] scripts]# sh compare2.sh 10 10

10 equal 10

[[email protected] scripts]# sh compare2.sh 10 1

10 great than 1

[[email protected] scripts]# sh compare2.sh 10 50

10 less than 50

[[email protected] scripts]# sh compare2.sh 6 7 8 9 10

please input num1 & num2: