The create directory command, cd, is one of those commands that I use almost every day on the command line. I realized after listening to a recent podcast [footnote]Pretty much any Back to Work episode where they talk about TextExpander :)[/footnote], I should look at how many keystrokes I do and where I can make things more efficient.

[bash]function mcd() {
mkdir $1
cd $1
}[/bash]

One extra character in the command to create a directory not only creates the new directory but then changes into that directory. [footnote]Which is what you do almost 100% of the time when you create a new directory.[/footnote] This saves at least 4 keystrokes each time I create a new directory!