Shell腳本傳參數(shù)的方法介紹

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一、接收固定長度的參數(shù)

代碼如下:

[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(shù)執(zhí)行

代碼如下:

[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(shù)執(zhí)行

代碼如下:

[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(shù)怎么辦呢?還要一個個加上來嗎?答案是否定的

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

代碼如下:

[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

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(zhí)行過程如下
不傳參數(shù)執(zhí)行

代碼如下:

[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(shù)執(zhí)行

代碼如下:

[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(shù)執(zhí)行

代碼如下:

[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(shù)怎么辦呢?或者我也不確定到底會傳幾個參數(shù).
解決方法如下,詳細執(zhí)行結(jié)果如下

代碼如下:

[root@svn shell_example]# cat manyparams.sh
#!/bin/bash
#這是個測試腳本傳N個參數(shù)的例子

echo "我的名字是 `basename $0` - 我是調(diào)用自 $0"
echo "我有 $# 參數(shù)"

count=1
while [ "$#" -ge "1" ];do
    echo "參數(shù)序號為 $count 是 $1"
    let count=count+1
    shift
done

一個參數(shù)執(zhí)行

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

我的名字是 manyparams.sh - 我是調(diào)用自 manyparams.sh
我有 1 參數(shù)
參數(shù)序號為 1 是 one

5個參數(shù)執(zhí)行

代碼如下:

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

我的名字是 manyparams.sh - 我是調(diào)用自 manyparams.sh
我有 5 參數(shù)
參數(shù)序號為 1 是 one
參數(shù)序號為 2 是 two
參數(shù)序號為 3 是 three
參數(shù)序號為 4 是 four
參數(shù)序號為 5 是 five

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