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awk - a powerful data extraction and manipulation tool

Unix and Linux come with a whole toolkit of utility programs for filtering, sorting and manipulating data. As a "one off" job, you can use them from the command line, and for repeated jobs you can save a series of instructions for these tools in a shell script. Yesterday, I ran a private shell scripting bootcamp course, and found myself enjoying working with

grep - the filtering tool
sort - the tool that re-orders data
awk - for pattern matching and data manipulation
sed - the stream editor
tr - for transforming characters

Awk is especially worthy of mention. With Awk, you can select rows of data based on what they contain, or what is in certain fields, and manipulate those lines. Instructions may be given to allow different instructions depending on how they're elected, and awk also includes integer and floating point arithmetic capabilities, and the ability to undertake actions before and after the processing of any of the data, in matching clauses called BEGIN and END.

I have added sample awk scripts here and here to our web site, and a slightly longer article on awk here. And, yes, I can deliver training on awk and shell scripting ;-) ... Linux/Unix Basics will get you started, and we can tailor to meet your needs from there!
(written 2007-09-25)

 
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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