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The Ultimate Linux Shell Scripting Guide
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As either a Linux systems administrator or an office worker who uses Linux on the desktop, you’ll probably have a certain number of text files that you need to work with. You may even get tasked with extracting data from these files and presenting the data effectively.
Or, you might need to extract data from utilities that show the status of your Linux system or from within scripts that automatically scrape the web for some specific information. The text-stream filter utilities that I present in this topic can help make these jobs easier. Once you learn them, you may even find that you can extract and display data with them more quickly than you could with text editors or word processors.
Figure 6.1: The basic concept of text-stream filters
With only one exception, you won’t use these utilities to modify the original text file. You’ll use them either to view the selected data on-screen, pipe the selected data...