Chapter 9. Learn Shell Scripting
This chapter covers many aspects of shell scripting. In keeping with the spirit of the book, it’s not an A-to-Z tutorial on the subject. Rather, each project tackles a particular technology pertinent to writing shell scripts. The 13 projects cover the following topics:
Bash functions in a script, parameter expansion, here-documents, and script debugging
Regular expressions, both modern (extended) and obsolete (basic)
Shell quoting
Forming conditions for use in conditional expressions
Subshells and command blocks
Traps and handles, and how to implement them in a shell script
If you are not familiar with writing shell scripts, read Projects 9 and 10 for an introduction. See Project 4 for a discussion of shell and environment ...
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