Garbage output is being displayed if a command executed is not valid\found in Red Hat Enterprise Linux 8

Issue

• The command shell will display some unnecessary\garbage outputs when an executed command is not a valid command.

  bash: nmap: command not found...
  Failed to search for file: Cannot update read-only repo
  
  or,
  
  bash: lsz: command not found...
  Failed to search for file: cannot update repo 'rhel-8-for-x86_64-appstream-rpms': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried; Last error: Status code: 404 for https://satellite.example.com/pulp/repos/fhlb_atl/nonprod/RHEL8/content/dist/rhel8/8.0/x86_64/appstream/os/repodata/repomd.xml