The terminal might be the most ubiquitous piece of software between *nix flavors, if there's a single application you should probably learn the defaults for, it

The terminal might be the most ubiquitous piece of software between *nix flavors, if there's a single application you should probably learn the defaults for, it's gonna be that one. Last thing you want to do is look like an idiot trying to fix your friend's computer because you can't even remember how to get around in their default bash shell. This gives me an interesting idea, though... Are there any "portable shell" applications that painlessly provide a mechanism for storing your preferred shell, necessary dependencies and configuration files on a thumb drive that's as easy to use as `/mnt/shelldrive/zsh`?