ecial Parameters 16 3.5 Shell Expansions 17 3.5.1 Brace Expansion 17 3.5.2 Tilde Expansion 18 3.5.3 Shell Parameter Expansion 19 3.5.4 Command Substitution 21 3.5.5 Arithmetic Expansion 22 3.5.6 Process Substitution 22 3.5.7 Word Splitting 22 3.5.8 Filename Expansion 23 3.5.8.1 Pattern Ma