一、接收固定長度的參數

[root@svn shell_example]# cat params.sh

#!/bin/bash

#傳參測試腳本

echo "My name is `basename $0` -I was called as $0"

echo "My first parameter is : $1"

echo "My second parameter is : $2"

空參數執行

[root@svn shell_example]# sh params.sh

My name is params.sh -I was called as params.sh

My first parameter is :

My second parameter is :

傳遞2個參數執行

[root@svn shell_example]# sh params.sh one two

My name is params.sh -I was called as params.sh

My first parameter is : one

My second parameter is : two

二、那如果還有參數怎么辦呢?還要一個個加上來嗎?答案是否定的

以下用法應該不陌生,就是直接執行腳本本身,沒有附帶任何參數,那么腳本講拋出幫助信息.即怎么使用此腳本.見紅字部分

[root@svn shell_example]# sh params_v2.sh

My name is params_v2.sh -I was called as params_v2.sh

I was called with 0 parameters.

Usage: params_v2.sh first second

You provided 0 parameters,but 2 are required.

代碼如下

[root@svn shell_example]# cat params_v2.sh

#!/bin/bash

# 這是個測試腳本傳參的測試例子

echo "My name is `basename $0` -I was called as $0"

echo "I was called with $# parameters."

if [ "$#" -eq "2" ];then

echo "My first parameter is $1"

echo "My second parameter is $2"

else

echo "Usage: `basename $0` first second"

echo "You provided $# parameters,but 2 are required."

fi

詳細的執行過程如下

不傳參數執行

[root@svn shell_example]# sh params_v2.sh

My name is params_v2.sh -I was called as params_v2.sh

I was called with 0 parameters.

Usage: params_v2.sh first second

You provided 0 parameters,but 2 are required.

傳遞3個參數執行

[root@svn shell_example]# sh params_v2.sh one two three

My name is params_v2.sh -I was called as params_v2.sh

I was called with 3 parameters.

Usage: params_v2.sh first second

You provided 3 parameters,but 2 are required.

傳遞2個參數執行

[root@svn shell_example]# sh params_v2.sh one two

My name is params_v2.sh -I was called as params_v2.sh

I was called with 2 parameters.

My first parameter is one

My second parameter is two

問題來了,要是后期還要加參數怎么辦呢?或者我也不確定到底會傳幾個參數.

解決方法如下,詳細執行結果如下

[root@svn shell_example]# cat manyparams.sh

#!/bin/bash

#這是個測試腳本傳N個參數的例子

echo "我的名字是 `basename $0` - 我是調用自 $0"

echo "我有 $# 參數"

count=1

while [ "$#" -ge "1" ];do

echo "參數序號為 $count 是 $1"

let count=count+1

shift

done

一個參數執行

[root@svn shell_example]# sh manyparams.sh one

我的名字是 manyparams.sh - 我是調用自 manyparams.sh

我有 1 參數

參數序號為 1 是 one

5個參數執行

[root@svn shell_example]# sh manyparams.sh one two three four five

我的名字是 manyparams.sh - 我是調用自 manyparams.sh

我有 5 參數

參數序號為 1 是 one

參數序號為 2 是 two

參數序號為 3 是 three

參數序號為 4 是 four

參數序號為 5 是 five

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