x11vnc, xdotool, rev: add pages (#1264)

pages/common/rev.md

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+# rev
+
+> Reverse a line of text.
+
+- Reverse the text string "hello":
+
+`echo "hello" | rev`
+
+- Reverse an entire file and print to stdout:
+
+`rev {{file}}`

pages/linux/x11vnc.md

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+# x11vnc
+
+> A VNC server that will enable VNC on an existing display.
+> By default, once a client disconnects the server will terminate.
+
+- Launch a VNC server that allows multiple clients to connect:
+
+`x11vnc -shared`
+
+- Launch the server where the user can only view the screen, and will continue to run even after the last client disconnects:
+
+`x11vnc -forever -viewonly`
+
+- Launch a VNC server on a specific display and screen:
+
+`x11vnc -display :{{screen}}.{{display}}`
+
+- Launch a VNC server on screen 2 with the default display:
+
+`x11vnc -display :{{2}}`
+
+- Launch a VNC server on the second monitor:
+
+`x11vnc -display :{{0}}.{{1}}`

pages/linux/xdotool.md

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+# xdotool
+
+> Command line automation for X11.
+
+- Retrieve the X-Windows window ID of the running Firefox window(s):
+
+`xdotool search --onlyvisibile --name {{firefox}}`
+
+- Click the right mouse button:
+
+`xdotool click {{3}}`