Toggle a MacBook's Wifi with a Bash One-Liner

Sometimes the easiest way is a bash one-liner.  (Think Alfred shortcuts, BetterTouchTool gestures, Terminal.app.)  Running an applescript is all fine and dandy, but it's heavy.  Here's how to toggle your MacBook wifi on or off, where the wifi interface is en0.

( networksetup -getairportpower en0 | grep On ) \
   && ( networksetup -setairportpower en0 Off ) \
   || ( networksetup -setairportpower en0 On )

This is one of those messed-up bash-isms that uses conditional logic in the "wrong" way, elegantly.

Setting Processing's User-Agent for loadXML

In Processing, I'm fetching Yahoo's weather forecast for my location.  The loadXML() function is perfectly happy to take a URL, so I can just point it at my location's RSS feed.

In its default mode, this sends a user-agent string of "Java/1.6.0_51" which reflects my current Java version.  But I want to set my User-Agent, to something more descriptive.  If my project misbehaves, or an operator gets curious, it would be polite to have a more descriptive string with some contact info.

You can prepend a string to the user-agent by specifying it in your setup() function.

void setup () {
  System.setProperty("http.agent", "abstractForecast; https://github.com/fnaard/abstractForecast;");
}

Which results in the web server logging a user-agent of:

abstractForecast; https://github.com/fnaard/abstractForecast; Java/1.6.0_51

Oracle has some documentation on the network properties you can set.  There are more, notably: proxy settings, IPv4/v6 preference, and DNS caching behavior.

Types of PS3 Hard Drive Caddies

I sent a friend's PS3 in for service, and they ask you to pull out your hard drive if you've upgraded it.  I did, but then at some point I discarded or lost the caddy that it belongs in.  There are four generations of PS3, and each has its own style of caddy.  Here's how it goes.

Generation	Models	Caddy
Old Fatty	CECHA01 CECHB01 CECHG01 CECHE01	Wire Pull-Tab
Newer Fatty	CECHH01 CECHK01 CECHL01 CECHP01	Flat Metal Pull-Tab
Slim	CECH-2001A CECH-2001B CECH-2101A CECH-2101B CECH-2501A CECH-2501B CECH-3001A CECH-3001B	Side Flange
Slimmer	CECH-4001B CECH-4001C	Swing-Out Tab