$ yum
Yum command has been deprecated, redirecting to '/usr/bin/dnf '.
See 'man dnf' and 'man yum2dnf' for more information.
To transfer transaction metadata from yum to DNF, run:
'dnf install python-dnf-plugins-extras-migrate && dnf-2 migrate'
You need to give some command
usage: dnf [options] COMMAND