Posted by knorby on June 6, 2008 under ACM, Chicago, GSoC, OpenBSD, blogs, coding, globus, google, personal, uchicago | 
It’s true! Borja wrote up a summary of the GSoC lightening talk event, including pictures. If you don’t know what I look like, I am in both the GSoC student one and the ACM officer one. I really wish I got a haircut before this thing….
Borja linked to our website, which hopefully won’t get too much traffic. It is currently at 359 days of uptime, and I have shooting for a year of uptime before upgrading to the latest and greatest version of OpenBSD.
Posted by knorby on April 10, 2008 under Apple, Linux, OpenBSD, Solaris, humor, shell scripting |
I had some good old fashion fun today on the shell today. I stumbled across this “gem” of an expression:
yes xargs | xargs yes
This expression can be repeated infinitely (mostly) many times without changing the output and without loosing symmetry when joining on the yes’s. In other words, the last expression is equivalent (in regards to output and symmetry):
yes xargs | xargs yes xargs | xargs yes xargs | xargs yes xargs | xargs yes xargs | xargs yes xargs | xargs yes xargs | xargs yes xargs | xargs yes xargs | xargs yes xargs | xargs yes xargs | xargs yes xargs | xargs yes
You can throw some rot13s (with care), cats, and a few other commands in there with the same effect. I am not sure exactly how it functions; it seems to work different on different OSes. I have tried in on Linux, Mac OS X, Solaris, and OpenBSD, and all seem to be a bit different. They seem to run a bit differently, and the output is different. It’s all very fun.
Update: I thought I should clarify that last little bit. The way pipes are treated seems to vary some; the actual functionality is trivial.
