There are a number of commands named "trash". But I don't want to keep in mind to execute "trash-empty" occasionally, especially when rm'ing the same large file

There are a number of commands named "trash". But I don't want to keep in mind to execute "trash-empty" occasionally, especially when rm'ing the same large file several times (say, ones made by "dd if=/dev/zero ..."). So either a cron job for emptying the trash, or I think more elegantly, have "trash" just empty the trash before trashing the next file (i.e. there is only ever one thing in the trash).