The SCHEMA:PATH part seems slightly wrong (singular vs. plural). Try:
schema=org.gnome.settings-daemon.plugins.media-keys.custom-keybinding
path=/org/gnome/settings-daemon/plugins/media-keys/custom-keybindings/custom1/
gsettings get "${schema}:${path}" binding
gsettings get "${schema}:${path}"command
gsettings get "${schema}:${path}" name
The SCHEMA:PATH part seems slightly wrong (singular vs. plural). Try:
schema=org.gnome.settings-daemon.plugins.media-keys.custom-keybinding path=/org/gnome/settings-daemon/plugins/media-keys/custom-keybindings/custom1/ gsettings get "${schema}:${path}" binding gsettings get "${schema}:${path}" command gsettings get "${schema}:${path}" name