命令行参数前的「-」和「--」有什么区别？

https://www.zhihu.com/question/267095526

http://commons.apache.org/proper/commons-cli/index.html

git中有的命令参数为什么使用一个横杠 - 有的命令却使用两个横杠 -- ?

https://www.zhihu.com/question/41366215

shell命令行中flag的使用方法

https://blog.csdn.net/c359719435/article/details/78785156

Command-Line Options

http://www.catb.org/esr/writings/taoup/html/ch10s04.html

What's the difference between a flag, an option, and an argument?

https://unix.stackexchange.com/questions/285575/whats-the-difference-between-a-flag-an-option-and-an-argument