Often these machinations are necessary perform on lists of filenames and paths. There are many specializ... hells the expansion of a wild card pattern into a list of filenames (called "globbing") is done by the s... and is executed. Thus the command normally sees a list of filenames (like "foo.txt bar.txt etc.txt") whe... arameter expansion" features is to iterate over a list of components in a single variable.
For example,
