Linux - Shell - arithmetic expressions - arithmetic

1. Outline
   1. Based on the shell $ (()) of the arithmetic
2. background
   1. Review shell script
   2. Make up the numbers right
3. ready
   1. surroundings
      1. the
         1. centos7

1. arithmetic

1. Code

   #!/bin/bash
   
   # $(()) 的数学运算, 里面的内容, 被解释为 算数表达式
   # $(()) 内的变量, 可以不加 $
   # 只看 正整数
   
   arg1=4
   arg2=5
   # 算数运算
   # 1. +
   var1=$((arg1+arg2))
   echo $var1
   
   # 2. -
   var2=$((arg1-arg2))
   echo $var2
   
   # 3. *
   var3=$((arg1*arg2))
   echo $var3
   
   # 4. /
   var4=$((arg1/arg2))
   echo $var4
   
   # 5. %
   var5=$((arg1%arg2))
   echo $var5