Shell脚本_位置参数和预定义参数

一、位置参数变量

 

1、输出两个输入参数之和 l1.sh

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#!/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

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#!/bin/bash

 

echo "所有参数个数:$#"

echo "所有参数:$*"

echo "所有参数:$@"

3、$*和$@的区别 l3.sh

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#!/bin/bash

 

for i in "$*"

        do

          echo "\$\*的参数是:$i"

        done

 

 

for i in "$@"

        do

          echo "\$\@的参数是:$i"

        done

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