Detailed explanation of command-expr

The expr command is an expression calculation tool, use it to complete the evaluation operation of expressions.

Common operators for expr:

加法运算：+
减法运算：-
乘法运算：\*
除法运算：/
求摸（取余）运算：%

grammar

expr(选项)(参数)

Options

--help：显示指令的帮助信息；
--version：显示指令版本信息。

parameter

表达式：要求值的表达式。

Example

result=`expr 2 + 3`
result=$(expr $no1 + 5)

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