shell-Special variables

1. Position variable.
   

   $ $ Gets the file name of the currently executing shell script.

   [Email protected] ~]# vim 0.sh

   [email protected] ~]# cat 0.sh

   Echo

   [[Email protected] ~]# sh 0.sh

   0.sh

   [Email protected] ~]#

2. If I put it in the full path, it will.
3. 
   

[email protected] ~]# sh/root/0.sh

/root/0.sh

$ A to-$ is the corresponding first variable, such as $ $ is the corresponding value of the initial variable, if it is $10, you want to use {} brackets, such as ${10}

[[email protected] ~]# sh 0.sh zhouyu

Zhouyu

By the way, SEQ is sending from which value to which value, such as command

Seq-s "" 1 10

Is that sending 1 to 10 is separated by a space,

[email protected] ~]# seq-s "$" 1

1 $ $4 $ $6 $7 $8 $9 $

$ #是指命令行参数的总个数. If you give the command line argument there are 10 then $ #就是10

DirName $ is to take the directory out of the script.

BaseName is taking out the name.

[email protected] ~]# cat 0.sh

dirname

basename

[email protected] ~]# sh/root/0.sh

/root

0.sh

[email protected] ~]#

You can take a look at the usage of the/etc/init.d/nfs file for these parameters.

This article is from "Love Zhou Yu" blog, please be sure to keep this source http://izhouyu.blog.51cto.com/10318932/1886164

shell-Special variables