* If `fl` is called without arguments then the current folder is opened in ForkLift. Is equivalent to `fl .`
<code>fl [*file_or_folder*]</code>
* If `fl` is called with a directory as the argument, then that directory is opened in ForkLift
* If `fl` is called without arguments then the current folder is opened in ForkLift. This is equivalent to `fl .`.
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* If `fl` is called with a directory as the argument, then that directory is opened in ForkLift. If called with a non-directory file as the argument, then the file's parent directory is opened.