How do you close all unchanged Files?

[whitten]

I inadvertently said joe * in a directory with many many files.
Joe opened them and gave me a small window to edit each.
Since I intended to edit only one file, and it was near the top,
I then spent quite a while typing ^K-Q repeatedly as a new window
moved to the top of the screen for yet-another file that I hadn't changed
and didn't want to change by accident.

Is there something else I could have done?

I couldn't figure out how to find this in the documentation.
I did take a bit of time reading some of it, but clearly it was
faster to just slog through all the windows.

[ianmcgowan]

I've done this, and if it's just a few dozen files open just hold down Ctrl-C to "Abort". If it were a few thousand I'd be tempted to tab over to another session and kill the joe process.

[whitten]

As I said, I slogged through CNTL-K CNTL-Q for several hundred windows.
Do I understand that there is no other action I could have taken?
How do I know I won't break anything by killing the joe process?