rehashx(self, parameter_s='')
rehashx explicitly checks that every entry in $PATH is a file with execute access (os.X_OK).
Under Windows, it checks executability as a match against a '|'-separated string of extensions, stored in the IPython config variable win_exec_ext. This defaults to 'exe|com|bat'.
This function also resets the root module cache of module completer, used on slow filesystems.
Update the alias table with all executable files in $PATH.
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