xvfb-run:tldr:d987f

xvfb-run: Try to get a free server number, if the default (99) is not available.

xvfb-run

$ xvfb-run --auto-servernum ${command}

try on your machine

The command "xvfb-run --auto-servernum ${command}" is used to run a command in a virtual X server environment. Let's break it down:

"xvfb-run" is a utility that starts a virtual X server (Xvfb) on the system. Xvfb is a program that emulates a graphical display server without needing any physical display hardware. It allows you to run graphical applications in a headless environment, such as on a server without a desktop environment.
"--auto-servernum" is an option for xvfb-run that automatically assigns a unique server number to the virtual X server. The server number is used to identify the X server instance and avoid conflicts when multiple instances are running simultaneously.
"${command}" is a placeholder that represents the actual command you want to run in the virtual X server environment. You would replace "${command}" with the command you want to execute.

So, when you run the full command "xvfb-run --auto-servernum ${command}", it starts a virtual X server with a unique server number and then executes the specified command within that virtual X server environment. This allows the command to run as if it were running in a graphical display environment, even though no physical display is attached.

This explanation was created by an AI. In most cases those are correct. But please always be careful and never run a command you are not sure if it is safe.

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