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- Filenames in Unix may be composed of any characters, even non-
- printing characters (although not so useful). However, conventionally,
- filenames have an "extension" composed of the period and a descriptive
- character or characters. For example, C-language programs must
- be named a name whose last two characters are ".c". Note that this
- is not really an "extension"; it's just that the last two characters
- of the filename are "." and "c". Pascal programs may be named
- ending in ".pas" or ".p" . Fortran programs must end in ".f"
-