bash: add disp() function to quickly set DISPLAY (disp.bash)

bashrc.d/disp.bash

@@ -0,0 +1,9 @@
+function disp() {
+    if [[ $1 =~ ":" ]] ; then
+        VALUE=$1
+    else
+        VALUE=localhost:$1.0
+    fi
+
+    export DISPLAY=$VALUE
+}