I wrote a tutorial on grep back in February. If you need more than the tiniest of explanations as to what grep is, I suggest you run over to my introductory tutorial. The quick and dirty intro, though, is that grep is mostly used to strip information out of a text file.
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This weekend I was planning to write a follow-up to my Intro to grep tutorial, but I decided to put that off for a bit. One of my friends asked me about extracting a subset of information from each line of a text file. Basically, he wanted the URL’s of all the RSS feeds in his OPML file. Because grep returns whole lines, it isn’t equipped to the task. However, Linux comes with two popular stream editors: awk and sed. Today, I’m going to give you a proof-by-example of awk.
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Hello ladies and germs, as I’ve told you before, I dig around in the Linux man pages quite a bit. We’ve talked about a few in-depth Linux commands on here, and today I’m going to scale it back and talk about a command critical to my everyday usage. Therefore, read on and learn the ins and outs of the “history” command.
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