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I would like to know the diffrence beteen the following commands:

  1. sudo x11vnc
  2. sudo x11vnc -auth /var/lib/lightdm/.Xauthority -display :0

thank you in advance.

  • Which version of Ubuntu are you using? – user68186 Jun 8 '18 at 11:52
  • Are you familiar with the man command? man sudo;man x11vnc – waltinator Jun 8 '18 at 13:20
  • @waltinator just need the man x11vnc – damadam Jun 8 '18 at 13:31
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It is the same command so there is no difference.

If you meant: what do the options mean: the manual explains it like this:

Options

-display disp

X11 server display to connect to, usually :0. The X server process must be running on same machine and support MIT-SHM. Equivalent to setting the DISPLAY environment variable to disp.

-auth file

Set the X authority file to be file, equivalent to setting the XAUTHORITY environment variable to file before startup. Same as -xauth file. See xsecurity(7) , xauth(1) man pages for more info.

Related:

  • so probably using sudo x11vnc is the default command which called sudo x11vnc -auth /var/lib/lightdm/.Xauthority -display :0 – damadam Jun 8 '18 at 13:30

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