Fedora 22: dnf has replaced yum
you should now use "dnf" in Fedora 22 to replace yum, something like
$ dnf update
$ dnf autoremove
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
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