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diff --git a/.config/fish/functions/sessiontype.fish b/.config/fish/functions/sessiontype.fish
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+# https://unix.stackexchange.com/questions/202891/how-to-know-whether-wayland-or-x11-is-being-used/371164#comment573431_325972
+
+function sessiontype
+    # https://unix.stackexchange.com/questions/202891/how-to-know-whether-wayland-or-x11-is-being-used/371164#comment573431_325972
+    # have to run it first?
+    loginctl > /dev/null
+    loginctl show-session (loginctl | awk '/tty/ {print $1}') -p Type | awk -F= '{print $2}'
+end