Shell脚本传参数方法总结

http://www.jb51.net/article/65677.htm

一、接收固定长度的参数
复制代码 代码如下:

[root@svn shell_example]# cat params.sh

!/bin/bash

传参测试脚本

echo “My name is basename $0 -I was called as $0” echo “My f<a href="https://www.jb51.cc/tag/irs/" target="_blank" class="keywords">irs</a>t p<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>meter is :$1”
echo “My second parameter is : $2”

空参数执行
复制代码 代码如下:

[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 :

传递2个参数执行
复制代码 代码如下:

[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、那如果还有参数怎么办呢?还要一个个加上来吗?答案是否定的
以下用法应该不陌生,就是直接执行脚本本身,没有附带任何参数,那么脚本讲抛出帮助信息.即怎么使用此脚本.见红字部分
复制代码 代码如下:

[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.

代码如下
复制代码 代码如下:

[root@svn shell_example]# cat params_v2.sh

!/bin/bash

这是个测试脚本传参的测试例子

echo “My name is basename $0 -I was called as $0” echo “I was called with$# parameters.”
if [ “$#” -eq “2” ];then echo “My f<a href="https://www.jb51.cc/tag/irs/" target="_blank" class="keywords">irs</a>t p<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>meter is$1”
echo “My second parameter is $2”
else
echo “Usage: basename $0 first second”
echo “You provided $# parameters,but 2 are required.”
fi
详细的执行过程如下
不传参数执行
复制代码 代码如下:

[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.

传递3个参数执行
复制代码 代码如下:

[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.

传递2个参数执行
复制代码 代码如下:

[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
问题来了,要是后期还要加参数怎么办呢?或者我也不确定到底会传几个参数.
解决方法如下,详细执行结果如下
复制代码 代码如下:

[root@svn shell_example]# cat manyparams.sh

!/bin/bash

这是个测试脚本传N个参数的例子

echo “我的名字是 basename $0 - 我是调用自 $0” echo “<a href="https://www.jb51.cc/tag/woyou/" target="_blank" class="keywords">我有</a>$# 参数”
count=1
while [ “$#” -ge “1” ];do echo “参数序号为$count 是 $1”
let count=count+1
shift
done
一个参数执行
[root@svn shell_example]# sh manyparams.sh one
我的名字是 manyparams.sh - 我是调用自 manyparams.sh
我有 1 参数
参数序号为 1 是 one
5个参数执行
复制代码 代码如下:

[root@svn shell_example]# sh manyparams.sh one two three four five 我的名字是 manyparams.sh - 我是调用自 manyparams.sh 我有 5 参数 参数序号为 1 是 one 参数序号为 2 是 two 参数序号为 3 是 three 参数序号为 4 是 four 参数序号为 5 是 five