Programming on the move without internet access, but need gem documentation? 'gem server' is a command that comes with RubyGems, and starts a Webbrick instance with easy access to all of your gem rdocs. It's really handy. Thanks Scott!

If your SSH connection has ever died on you, you know that hitting the usual control characters don't work, because they're sent through the shell to the other side. Today, I learned how to kill it myself; the keyboard combination is:

Accidently use a permanent marker on your whiteboard? Write over the offending lines with a dry-erase marker, and wipe with the eraser.

Cell phone companies make more money when you're on the phone longer, which is why it's in their best interest to present you with a really long voicemail prompt. You already know how to leave a voicemail!

I just tried to clone a git repository over the local network, and received this message:

zsh:1: command not found: git-upload-pack
fatal: The remote end hung up unexpectedly

As I understand it (and I might be wrong), your path can change depending on where you're logging in from. Run this command on the REMOTE machine:

which git-upload-pack

and find out where that command actually exists. Then, run this on your LOCAL machine:

ssh yourself@REMOTEmachine echo \$PATH

which will log in, and tell you what your new path is. For me, the new path didn't contain the location of git-upload-pack, which is installed on MacPorts, which puts it in the /opt/local/bin directory. Create/update the following file on the REMOTE machine in your home folder:

.zshenv if you're running Zsh
.bashrc if you're running Bash

and include the new path with the location of the git commands.

You can make sure that any variable won't change during runtime by running the "freeze" method on it. Ruby will raise an exception if you attempt to change it.

This ISN'T foolproof. For example, it won't freeze objects inside of a container (like an array or a hash). But it's a handy tool nonetheless.

Found here: http://www.random-good-stuff.com/2008/12/05/diy-iphone-airplane-holder/

When using Sass to develop a webpage, Firebug reports on the line item of the converted CSS file, which isn't very helpful. Firesass makes Firebug return the appropriate line item in the original sass file. Simple, and very useful.

Download: https://addons.mozilla.org/en-US/firefox/addon/103988
Source: http://github.com/nex3/firesass

Sometimes you'll inadvertently send binary data to your terminal window. Some of that binary data will screw up your terminal, as it receives color change codes and random line breaks and who knows what else. You could close your terminal window and reopen it, but then you lose your working directory and temporary environment variables. But pressing +R will send the appropriate clearing signals, and fix your terminal window.

Need a calculation in a pinch? Type your statement on a line (2 + 5 * 16), and hit Control + Shift + C. Textmate will fill in the answer. (2 + 5 * 16 = 82)