Advanced Bash-Scripting Guide: A complete guide to shell scripting, using Bash
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Part 4. Advanced Topics

Table of Contents
19. Regular Expressions
20. Subshells
21. Restricted Shells
22. Process Substitution
23. Functions
24. Aliases
25. List Constructs
26. Arrays
27. Files
28. /dev and /proc
29. Of Zeros and Nulls
30. Debugging
31. Options
32. Gotchas
33. Scripting With Style
34. Miscellany
35. Bash, version 2
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Recess Time Regular Expressions