（十三）、向shell脚本中传参

一、向脚本中传递位置参数

向脚本中传递参数的数目理论上可以无数多，但是只有前9个能被访问，使用shift可以改变此限制

$0	$1	$2	$3	$4	$5	$6	$7	$8	$9
脚本名字	first	second	third	fourth	fifth	sixth	seventh	eighth	ninth

 1 $ vim param

 2

 3 #!/bin/sh

 4 echo  "This is the script     name                       : $0"

 5 echo  "This is the first       param                      : $1"

 6 echo  "This is the second   param                      : $2"

 7 echo  "This is the third       param                      : $3"

 8 echo  "This is the fourth     param                      : $4"

 9 echo  "This is the fifth        param                      : $5"

10 echo  "This is the sixth       param                      : $6"

11 echo  "This is the seventh   param                      : $7"

12 echo  "This is the eighth     param                      : $8"

13 echo  "This is the ninth       param                      : $9"
$ chmod u+x param 
$ ./param Did You See The Full Moon

This is the script     name                       : Did

This is the first       param                      : You

This is the second   param                      : See

This is the third       param                      : The

This is the fourth     param                      : Full

This is the fifth        param                      : Moon

This is the sixth       param                      : 
This is the seventh   param                      : 
This is the eighth     param                      :

This is the ninth       param                      :

二、向系统命令中传递参数

 1 $ vim findfile

 2 #！/bin/sh

 3 # findfile

 4 find / -name $1 -print   #find $1 in /

 5

 6 $ chmod u+x findfile

 7 $ findfile passwd

 8 /etc/passwd

 9 /etc/uucp/passwd

10 /usr/bin/passwd

三、特定变量参数

$#	传递到脚本的参数个数
$*	以一个单字符串显示所有向脚本传递的参数
$$	脚本运行的当前进程ID号
$!	后台运行的最后一个进程的ID号
$@	与$#相同，但是使用时加双引号
$-	显示shell使用的当前选项
$?	显示最后命令的退出状态

$ vim param

#!/bin/sh

echo  "This is the script     name                       : $0"

echo  "This is the first       param                      : $1"

echo  "This is the second   param                      : $2"

echo  "This is the third       param                      : $3"

echo  "This is the fourth     param                      : $4"

echo  "This is the fifth        param                      : $5"

echo  "This is the sixth       param                      : $6"

echo  "This is the seventh   param                      : $7"

echo  "This is the eighth     param                      : $8"

echo  "This is the ninth       param                      : $9"

echo  "The number of arguments  passed            : $#"

echo  "show all arguments                                 :  $*"

echo  "did my script go with any errors                : $?"

$ chmod u+x param

$ ./param Did You See The Full Moon

This is the script     name                       : Did

This is the first       param                      : You

This is the second   param                      : See

This is the third       param                      : The

This is the fourth     param                      : Full

This is the fifth        param                      : Moon

This is the sixth       param                      :

This is the seventh   param                      :

This is the eighth     param                      :

This is the ninth       param

The number of arguments  passed            : 6

show all arguments                                 :  Did You See The Full Moon

did my script go with any errors                : 0

巴特西

（十三）、向shell脚本中传参

一、向脚本中传递位置参数

二、向系统命令中传递参数

三、特定变量参数

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