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：%
expr(选项)(参数)
--help：显示指令的帮助信息； --version：显示指令版本信息。
表达式：要求值的表达式。
result=`expr 2 + 3` result=$(expr $no1 + 5)
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