Create XDG.md

Cheat Sheets/DevOps Linux/XDG.md

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+## CLI Tools
+
+    # Open with registered program
+    xdg-open <url|file>
+
+    # Send mail
+    xdg-email --cc  <address(es)> \
+              --bcc <address(es)> \
+              --subject <text> \
+              --body <text> \
+              --attach <file> \
+              <address(es)>
+
+    # Query mime type registration
+    xdg-mime query default x-scheme-handler/https
+
+    xdg-user-dir    # Get home dir
+
+    # Get special dir
+    xdg-user-dir <DESKTOP|DOWNLOAD|TEMPLATES|PUBLICSHARE|DOCUMENTS|MUSIC|PICTURES|VIDEOS>
+
+    xdg-screensaver suspend <window>
+    xdg-screensaver resume <window>
+    xdg-screensaver activate
+    xdg-screensaver lock
+    xdg-screensaver reset
+    xdg-screensaver status
+
+## Environment variables
+
+Typical XDG env vars
+
+    XDG_CONFIG_DIRS=/etc/xdg/xdg-ubuntu:/etc/xdg
+    XDG_CURRENT_DESKTOP=ubuntu:GNOME
+    XDG_DATA_DIRS=/usr/share/ubuntu:/usr/share/gnome:/home/lars/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share/:/usr/share/:/var/lib/snapd/desktop
+    XDG_MENU_PREFIX=gnome-
+    XDG_RUNTIME_DIR=/run/user/1000
+    XDG_SESSION_CLASS=user
+    XDG_SESSION_DESKTOP=ubuntu
+    XDG_SESSION_TYPE=wayland