If I use Gedit or Subl (sublime text) commands in the terminal to open a file, I can't do anything else in the terminal until I close the text editor. How can I fix this?
The first thing you should always do after installing software (apart from viewing the manpages) is to check and see if it supports plugins. If you are not a programmer or hacker it really is the easiest way to extend capabilities. The Gnome text editor supports this feature out of the box.Here's three of the best.
Gedit is a text editor. The Gedit homepage list its full feature set..