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So lets say I'm executing a command on the CLI and it spawns a GUI and I forget the & at the end. Now I want my shell back, so I hit a ctrl-z but the GUI locks up! Is there any way to do a ctrl-z without locking up the GUI? I am using Linux with a bash shell, xorg and gnome. This is an Ubuntu system.

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Use bg to put the command that you have stopped in the background.

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It says "no such job" – Rook Sep 28 '10 at 19:49
When you stop the job you will get something like [n]+ command stopped enter bg n to backgrounds the job – Iain♦ Sep 28 '10 at 20:02
Type 'jobs' to see currently running jobs. You should be able to pick the one you need from here. It'll probably be marked 'stopped'. – wzzrd Sep 28 '10 at 20:18
and @wzzrd yeah but its not a job, its just a command like firefox. – Rook Sep 29 '10 at 1:01
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Check out GNU Screen. It is very useful for this type of thing as well as offering a bunch of other terminal multiplexing functionality that can be very nice.

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I would call screen a lot of things, but a place to start GUI apps from and them (and it) leave them running until eternity wouldn't be one of them. Standard job control fits this job a lot better. – wzzrd Sep 28 '10 at 20:33
And why is that? X11 forwarding works perfectly fine through screen. The OP wasn't asking how to suspend and resume his application, he really just wanted his shell back, which screen will give him. – ErikA Sep 28 '10 at 20:42
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