You can use the high-level schema-aware gsettings tool:
$ gsettings list-recursively org.gnome.desktop.wm.keybindings | grep to-workspace org.gnome.desktop.wm.keybindings move-to-workspace-5 @as [] org.gnome.desktop.wm.keybindings switch-to-workspace-5 @as [] $ for i in $(seq 9); do gsettings set org.gnome.desktop.wm.keybindings move-to-workspace-$i "['<Shift><Super>$i']"; gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-$i "['<Super>$i']"; done
Unassign the shortcut from other actions, if any; for example:
$ gsettings list-recursively | grep Super | grep 3 org.gnome.shell.keybindings switch-to-application-3 ['<Super>3'] $ for i in $(seq 5); do gsettings set org.gnome.shell.keybindings switch-to-application-$i "[]"; done
Or you can use the low-level dconf tool, for example:
dconf write /org/gnome/desktop/wm/keybindings/switch-to-workspace-5 "['<Super>5']" dconf write /org/gnome/desktop/wm/keybindings/move-to-workspace-5 "['<Super><Shift>5']"