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As for GTK apps under Gnome environment it's possible to set all applications to use Emacs-like input scheme:

$ gconftool --set -t string /desktop/gnome/interface/gtk_key_theme Emacs
$ gconftool --get /desktop/gnome/interface/gtk_key_theme
Emacs

I wonder if it's possible to adjust input for all QT apps in a similar way.

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KDE doesn't use registry tools such as gconf everything done by system settings, but you can try kwriteconfig to set global environment for KDE applications. But I'm not sure either. You can read Hidden KDE Options and Features tutorial.

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That won't help him if Qt doesn't support Emacs key bindings. – Erik Jul 30 '12 at 5:19

Solution for Unity:

gsettings set org.gnome.desktop.interface gtk-key-theme "Emacs"
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It's a solution for GTK apps, not for Qt ones. – Hi-Angel Jul 17 '15 at 7:29

Not so obvious solution for GTK apps in Cinnamon:

gsettings set org.cinnamon.desktop.interface gtk-key-theme "Emacs"
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