There is no clear command, although this will be available in the gdancik/cloudera image.
Use /var/log/anaconda/anaconda.log instead of /var/log/yum.log
Use 'Configure firewall' instead of 'Erased: firewall'
When using vi, type :wq and [enter] to save the file and exit the text editor.
Skip this section. The man and other help commands are not installed.