x11vnc
TLDR
Launch a VNC server that allows multiple clients
$ x11vnc -shared
Launch a VNC server in view-only mode that doesn't terminate$ x11vnc -forever -viewonly
Launch on a specific display and screen$ x11vnc -display :[display].[screen]
Launch on the third display's default screen$ x11vnc -display :2
Launch on the first display's second screen$ x11vnc -display :0.1
SYNOPSIS
x11vnc [options]
DESCRIPTION
x11vnc allows VNC access to an existing X11 display. Unlike other VNC servers that create virtual displays, x11vnc shares the actual running desktop, allowing remote control of the physical display.
The server captures the display content and transmits it to VNC clients. By default, it terminates when all clients disconnect, unless -forever is specified.
PARAMETERS
-display _display_
X display to share (e.g., :0, :1.0)-shared
Allow multiple simultaneous clients-forever
Don't exit when last client disconnects-viewonly
Clients can only view, not interact-passwd _password_
Set VNC password-rfbauth _file_
Use password file-rfbport _port_
Set VNC port (default: 5900)-noxdamage
Disable X DAMAGE extension-clip _WxH+X+Y_
Share only a portion of the screen-scale _fraction_
Scale the framebuffer-ssl
Enable SSL/TLS encryption
CAVEATS
Requires an existing X display to be running. May have performance issues with compositing window managers. Security concerns when used without encryption; consider using -ssl or tunneling over SSH.
