There’s a bug in jQuery 1.4.3 that causes document.ready() to fire twice if there’s an unhanded exception. You can avoid it by wrapping the code that is throwing the exception inside a try/catch block.
The underscore is a special character in MySQL, and it can be used to match any character in comparison operations. If you’re not aware of this, it can throw you off when trying to search for it inside records.
You’d think I’d have this memorized by now, but I always mess up the syntax and have to spend a few minutes digging through man pages or wading through search results to find it.
tar -czf [output-file.tar.gz] [input-directory]/
mysqldump -u [username] -p [database name] > [filename]