How can you sync "learned spellings" between Macs OSX always tries to autocorrect the the unix commands that I save into my note taking application. 

To prevent this, I right click and tell OSX to "Learn Spelling". 

Is there a way to teach this spelling to all my Mac's? Ideally using iCloud or dropbox.
The spellings are located in various files in ~/Library/Spelling. Namely, LocalDictionary and various localisation files such as en_GB. You can sync this entire folder using a sync method of your choice.


To sync via iCloud, symlink the folder to/from a folder in ~/Library/Mobile Documents.
To sync via Dropbox, symlink the folder to/from a folder in your Dropbox.