Cats and dogs living together, mass hysteria, P=NP!

The thing that struck me is that there are no one letter commands in UNIX (that I can remember off the top of my head). Not sure if there's any reason for this besides namespace scarcity -- only 26 one-letter commands you can have!

It feels pretty arbitrary, I guess, to decide that Twitter is special enough that it gets to be one of the 26.

I like to think of it as reserving the 1-letter namespace for personal shell aliases. Everyone's going to have a different set of 26 most commonly-used commands.

"w" is standard on most UNIX machines,

At one time, "f" was a link to "finger" on many machines, but I think that's mostly died out now.

And of course there's "X", although you usually don't run that yourself at the command line unless you're debugging something.