This morning I changed the style of my desktop. I switched my desktop style to gtk. I am no longer able to go into the "application appearance inside of the desktop settings, if i try, the desktop settings just close. I am using arch linux. My question is how can I change the appearance style from a terminal since I am no longer able to go into the menu.
I have restarted several times with no positive results.
Thank you very much in advance.

I think it's file ~/.kde/share/config/kdeglobals or ~/.kde4/share/config/kdeglobals depending on where your distro puts your kde4 files

the line:
widgetStyle=xxxxxx

try changing to: widgetStyle=oxygen, but not sure how to get it to be initiated, maybe try restarting kde?

i had the same probleme once, and i uninstal the package qt-gtk-engine, after i was able to enter in the application appearance menu.

Thank you soo much I removed gtk-qt-engine and I am back in business.