how to run 2 or more commands in a shell script [for Linux & Windows]

To send 2 or more commands to Linux or Windows, one need to use some special characters to seperate the commands. These characters usually relate to & ; and|.
The following table show how exactly they’re applied in differet context.

condition	Windows	Linux
commands one by one	&	;
first one succeeded, then next	&&	&&
first one failed, then next	||	||
pipe	|	|

Example

To download some youtube video

To download some youtube video one by one and skip the failed ones, the command typed to the terminal should be as follow:
[for windows]

youtube-dl https://www.youtube.com/watch?v=q555kfIFUCM & youtube-dl https://www.youtube.com/watch?v=FTr3n7uBIuE & youtube-dl https://www.youtube.com/watch?v=SJDEOWLHYVo

[for Linux]

youtube-dl https://www.youtube.com/watch?v=q555kfIFUCM ; youtube-dl https://www.youtube.com/watch?v=FTr3n7uBIuE ; youtube-dl https://www.youtube.com/watch?v=SJDEOWLHYVo

reference

Linux中多命令执行’;’和’&&’的区别解释linux shell脚本之家
http://www.jb51.net/article/99193.htm

Linux:命令执行控制&&与|| - Socrates - 博客园
http://www.cnblogs.com/dyx1024/archive/2012/09/16/2687644.html

Linux 命令&和&&的区别 - 小宇宙的专栏 - CSDN博客
http://blog.csdn.net/u201017971/article/details/50912012

dos的&与&&有什么区别_百度知道
https://zhidao.baidu.com/question/1603884429797142147.html

批处理命令教学之复合语句连接符（&、&&和||）DOS/BAT脚本之家
http://www.jb51.net/article/63210.htm

批处理中 | || & &&的讲解_百度知道
https://zhidao.baidu.com/question/918430276432946939.html

批处理命令教学之复合语句连接符（&、&&和||）DOS/BAT脚本之家
http://www.jb51.net/article/63210.htm