I spend most of my time working on two systems, a desktop at work and a laptop at home. As I spend a lot of that time in the terminal I've setup some things to make sure my shell works exactly the same on both systems.
To achieve this I use Dropbox to sync all of my dotfiles, if you haven't used Dropbox before you should definately give it a go. It's a tool that keeps a folder in sync between your separate computer systems (and phone) with the nice bonus of automaticly saving previous versions of all of those files so if you accidentaly remove or overwrite one you can get it back easily.
In my Dropbox folder I've got a folder called
global files/dotfiles which
contains a lot of my dotfiles. The files and folders I keep in there are:
.gemrc .gitconfig, .gitignore_global, .oh-my-zsh, .railsrc, .tmux.conf, .vim,
.vimrc, .zsh_history, .zshenv
Obviously you should judge for yourself what files you will put in there but these files are the ones that make sense for me to keep in sync.
To keep the files in sync you'll have to copy the originals files to your dropbox folder and create a symlink to the Dropbox location in the old folder. For example:
cd ~ mv .gemrc Dropbox/global\ files/dotfiles/.gemrc ln -s Dropbox/global\ files/dotfiles/.gemrc .gemrc
After this your editor and shell should work exactly the same on all of your systems.