In sublime I know even if you don't save the changes in a file later one you can start from where you left off. I opened a new tab in sublime and closed the application before I save my file. Does sublime save a temp file somewhere in the computer (I am using MAC OSx)
Sublime Text 2 stores the files in ~/Library/Application Support/Sublime Text 2/Settings, in the .sublime_session files that are located there.
The contents of those files are a large JSON blob that contains the individual tab contents. Search in the file for the file name / tab name / a key word in the document and you should be able to get what you need.
For Sublime Text 3, use the following path:
~/Library/Application Support/Sublime Text 3/Local/Session.sublime_session
Credit to: eebbesen
I know it's a late answer but here's where I found it.
Linux: ~/.config/sublime-text-3/Local/Session.sublime_session
Windows: %USERPROFILE%\AppData\Roaming\Sublime Text 2\Settings\Session.sublime_session
Hope this helps someone someday.
As far as I know, Sublime Text keeps open files when you quit the application. However, if you close the tabs or project window without saving, the changes are lost.
In the former case, the files are saved in Local/Session.sublime-session (I'm using ST3 though, could be different in ST2!) You can open ST's packages folder from the command palette using "Browse Packages".
For Sublime Text 3,
Windows: %USERPROFILE%\AppData\Roaming\Sublime Text 3\Local\Session.sublime_session
来源：https://stackoverflow.com/questions/23257660/sublime-text-2-sublime-text-3-bring-back-unsaved-files-on-osx