After switching to sudo user over running vnc session unable to launch GUI applications from cli.

Solution Verified - Updated -

Issue

  • Switching to sudo user and running any X-application gives "Error: no DISPLAY environment variable specified" error.
  • sudo su - does not work for launching applications over vnc session.

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • tigervnc-server

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