Allhours,
upcp is not a linux command, ergo, man upcp would produce no output.
upcp IS a script, created by cPanel that updates cpanel, based upon the update options you have setup in your whm.
Even if you are not an "expert" at reading shell scripts, you can ssh to your box,
cd /scripts
and then
cat upcp |less
and you can scroll trough the script and more clearly see what it does
