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Considerations: - `./libexec/rbenv` executable is the entrypoint to the program; - BASH_SOURCE might be the path to a symlink that has activated `./libexec/rbenv`; - We must resolve the symlink to learn where rbenv's libexec directory is; - It's not guaranteed that rbenv commands will always remain directly under their own "libexec" directory, since a package maintainer can change that, e.g. rbenv commands are sometimes placed into `/usr/libexec/rbenv/*`; - Resolving symlinks might fail and in that case we just assume rbenv project layout.