You're trying trying to fix something that is not broken.
Documentation for wget can be find by searching Google, for example man wget
/usr/bin/wget is the path to the wget program.
-O - means output the content instead of writing it to disk
-q means to turn off output
Finally http://www.yourdomain.com/plug-in.php is an HTTP URL that wget is going to fetch.
So given this command, if you add it as a Cron Job in the DreamHost Web Panel, wget will fetch the URL and then the content returned will be sent to you by e-mail (given you enabled that in the Web Panel). Nothing particularly DreamHost or C-Panel specific involved.
Customer since 2000 openvein.org | Please don't feed the trolls. :@