Linux_Shell_位置参数和预定义参数

Posted 2020-08-14

一、位置参数变量

 

1、输出两个输入参数之和 l1.sh

1 2 3 4 5 6 7 8 9

#!/bin/bash   num1=$1 num2=$2 sum=$((num1+num2))   # 输出num1+num2之和   echo $sum

调用：chmod 755 l1.sh

./l1.sh 4 5

2、输出输入参数的个数和值 l2.sh

1 2 3 4 5

#!/bin/bash   echo "所有参数个数:$#" echo "所有参数:$*" echo "所有参数:[email protected]"

3、$*和[email protected]的区别 l3.sh

1 2 3 4 5 6 7 8 9 10 11 12 13 14

#!/bin/bash   for i in "$*"         do           echo "\$\*的参数是:$i"         done     for i in "[email protected]"         do           echo "\$\@的参数是:$i"         done ~                                                                                                                                                                                                           ~

二、预定义变量

 

来自为知笔记(Wiz)