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Mastering Linux Shell Scripting

You're reading from   Mastering Linux Shell Scripting Master the complexities of Bash shell scripting and unlock the power of shell for your enterprise

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Product type Paperback
Published in Dec 2015
Publisher
ISBN-13 9781784396978
Length 198 pages
Edition 1st Edition
Tools
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Author (1):
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Andrew Mallett Andrew Mallett
Author Profile Icon Andrew Mallett
Andrew Mallett
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Table of Contents (16) Chapters Close

Preface 1. What and Why of Scripting with Bash FREE CHAPTER 2. Creating Interactive Scripts 3. Conditions Attached 4. Creating Code Snippets 5. Alternative Syntax 6. Iterating with Loops 7. Creating Building Blocks with Functions 8. Introducing sed 9. Automating Apache Virtual Hosts 10. Awk Fundamentals 11. Summarizing Logs with Awk 12. A Better lastlog with Awk 13. Using Perl as a Bash Scripting Alternative 14. Using Python as a Bash Scripting Alternative Index

Passing parameters to functions


Earlier within this chapter, we referred to functions as scripts within scripts and we will still maintain that analogy. Similar to how a script can have input parameters, we can create functions that also accept parameters that can make their operation less static. Before we work on a script, we can look at a useful function in the command line.

Tip

One of my pet-peeves is over commented configuration files, especially where documentation exists to detail the options available.

The GNU Linux command sed can easily edit the file for us and remove commented lines and empty lines. We are introducing the stream editor, sed, here but we will look at it in more detail in the following chapter.

The sed command line that runs the in-place edit will be:

$ sed -i.bak '/^\s*#/d;/^$/d' <filename>

We can run out forensics in the command line by breaking it down element by element. Let's take a deeper look:

  • sed -i.bak: This edits the file and creates a backup with the...

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