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Nicholas Pretorius18,683 Points
The -b in this context is shorthand which instructs Git to do the following in one command:
- Create a new new branch with the specified name (gh-pages in your example)
- Checkout the newly created branch with the specified name
It is functionally equivalent to running:
- git branch gh-pages
And then running:
- git checkout gh-pages
See a list of flags and descriptions here from the Git docs.
Hope this helps