See also: What is the meaning of $? (dollar question mark) in shell scripts? Regular expression There are two types: BRE (Basic) and ERE (Extended). Basic is deprecated and only kept to not break APIs. Those are implemented by C API functions, and used throughout CLI utilities, e.g. grep accepts BREs by default, and EREs with -E. I'd like to know more about the advantages and disadvantages of forking a github project vs. creating a branch of a github project. Forking makes my version of the project more isolated from the I'd like to know the differences between doing a Fork of a project and doing a clone of it. Can I only send pull requests via GitHub if I've forked a project? In github, I often see these terms and in many cases they are used interchangeably. Can someone please explain the difference between a contributor and a collaborator?

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