dmenu: add page (#3474)

pages/linux/dmenu.md

@@ -0,0 +1,24 @@
+# dmenu
+
+> Dynamic menu.
+> Creates a menu from a text input with each item on a new line.
+
+- Display a menu of the output of the `ls` command:
+
+`{{ls}} | dmenu`
+
+- Display a menu with custom items seperated by a new line (`\n`):
+
+`echo -e "{{red}}\n{{green}}\n{{blue}}" | dmenu`
+
+- Let the user choose between multiple items and save the selected one to a file:
+
+`echo -e "{{red}}\n{{green}}\n{{blue}}" | dmenu > {{color.txt}}`
+
+- Launch dmenu on a specific monitor:
+
+`ls | dmenu -m {{1}}`
+
+- Display dmenu at the bottom of the screen:
+
+`ls | dmenu -b`