Bit masks are a computer science concept; in a nutshell, they represent options which can be combined in a variety of ways. A very basic example colors. Blue and Green combined create yellow.
In most established open source projects, you should find some sort of information regarding contributing to that given project. This could be called contribute.md or CONTRIBUTING.md or is simply a section
I found myself in a situation where I needed to list all of the global npm packages I had installed on a (windows) server. The command, it turned out, was quite simple: npm