Why the " unbound variable" error displayed while logging to the server?

Solution Verified - Updated -


  • Issue while logging onto the production host which is Red Hat Enterprise Linux 7.2
  • Getting weird error as below :
login as: root
root@test password:
Last login: Thu Apr 21 06:20:59 2016 from test
bash: QT_GRAPHICSSYSTEM_CHECKED: unbound variable
-bash: KSH_VERSION: unbound variable
-bash: PROMPT_COMMAND: unbound variable
root@test - [/root]
  • Even re-installing bash rpm also we get the same error. Please assist on this.
  • It happens when any user logs on the host.


  • Red Hat Enterprise Linux 7.2

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