shell script (1)

Before writing this file, I have not written a shell, I have only modified it before, I have seen the shell, haha

 

You can take a look at this blogger's simple explanation of the shell, which is very well written.

https://blog.csdn.net/miss1181248983/article/details/81278937

 

1. Create a file, preferably under / usr / local / sbin. I heard that it is convenient for management and subsequent maintenance.

//创建文件命令

sudo touch test.sh

2. Add content to the file

The first line should #!/bin/bashstart with, indicating that the file uses bashsyntax

#Remarks

Everyone else who has learned programming knows it at a glance, although I have never used php, haha.

#!/bin/bash
## This is my first shell script.
## Writen by homey 2019-11-13

date
echo "Hello World!"

3. Start running the shell script below

First of all, you will encounter permissions problems, as follows

cosun@cosun:/usr/local/sbin$ ./test.sh
-bash: ./test.sh: 权限不够

Now that the authority is not enough, then we will give it the authority, how to give it? as follows

cosun@cosun:/usr/local/sbin$ sudo chmod +x test.sh

Then the problem is coming, we usually execute chmod 755 and other commands + digital permissions, for example, this has read and write permissions. What permissions is chmod + x?

chmod +x的意思就是给执行权限,只有命令才可执行，所有可理解为给脚本执行权限。

then

cosun@cosun:/usr/local/sbin$ ./test.sh
2019年 11月 13日 星期三 09:43:39 CST
Hello World!

how about it? Will it be a shell script.