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Skimming files before you Grep them


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#1 OFFLINE   securitybreach

securitybreach

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Posted 30 October 2015 - 10:43 AM

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Grep is a utility to find string patterns in text files. I cannot show you all the magic that grep can perform. Often the stuff you want to find in a file is buried in a lot of crud you don’t want in the file. Web server files? Yeah. Those. Spreadsheets? Unfortunately, they get large too. Image files? Yes, those too! I’m going to focus on those towards the end. So, let’s review a few tricks…

Do you need the Regular Expressions?

Grep could be grep, fgrep, or egrep in the Linux world. If you’re looking for whole words or numbers and not doing a regular expression, you can save processor time by using fgrep.
Did it start with a “Capital Letter?” Get into the habit of using the -i switch with grep, to make your searches case-insensitive. This saves you time by making first runs get more matches......

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