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The PDF “GAWK: Effective AWK Programming” is also very handy, even for the proficient. The Addison-Wesley book on Awk, written by the language’s authors, is a concise goldmine, if still in print. There isn’t any need to do any work then, is there? ^(’ # Set FS to a regex.ġ1:22 33.3,44 # Feral input, typed in to test.ġ1 22 33.3 44 # Proof of correct handling of that. Since you can get at the whole line, you can do almost anything you want, but the logic is harder and the whole point to using awk is to make things easier.įor example, suppose you had a file from a data recorder that had an eight-digit serial number, followed by a six-character tag, and then two floating point numbers separated by colons. Some fields might have structured data with a variety of separators.
If you have data coming from a data logging instrument or some database, it could be formatted in a variety of ways. A surprising number of files fit this sort of format. This default behavior is great, especially since you can change the end of record character and the field separator. You can write code that manipulates the line or individual fields. Then it splits the line on fields using whitespace, or some other choice of field separators. The ProblemĪwk does a lot of common work for you when you use it to process text files. You won’t have to remember that $2 is the time field. In addition, you’ll be able to refer to the fields using names you decide.
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But for the purposes of this post, I’m going to assume you are using gawk.īy the end of the post, you’ll see how to use my awk add-on functions to split up a line into fields even when there is no single character to separate all fields. If you use a Debian-based distro, update-alternatives is your friend here. But it could also be mawk or some other flavor. Your system probably maps /usr/bin/awk to something and that something might be gawk. That is, you must use gawk and not other versions. I’ve used a simple set of functions to make awk a bit better, although I will warn you: it does require GNU extensions to awk. However, some of its limitations are often a bit annoying. Awk is a kind of Swiss Army knife for text files.
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