Useful Scripts

So I'm buying a USB stick that I'm planning on loading with important stuff and carrying everywhere. I'm also planning on loading it with random (mostly short) scripts in various languages (bash for Linux machines, powershell for Windows, and JavaScript for everything, because fucking every computer has a browser) that could be useful in random circumstances.

So, what scripts would you want to carry with you on a daily basis, /prog/? So far I've added a bunch just because I can, but the only useful ones I've added so far are bag sum and sorting.

>>6
Then you'd have to install it, which is exactly what >>1 is trying to avoid.