latex, bibtex "command not found" in Snow Leopard

I recently upgraded to Snow Leopard, and I have MacTex installed (and reinstalled since the OS upgrade). In iTerm (or any other terminal), my computer no longer recognizes bibtex or pdflatex commands. If I type, say, bibtex filename.aux (in the directory containing filename.aux), it returns "-bash: bibtex: command not found").

I have tried typing the whole path for bibtex, the file I want to process, or both (e.g., usr/texbin/bibtex ~/Documents/writing/filename.aux), but it still doesn't work. Even if I'm in usr/texbin, where bibtex is, it won't recognize bibtex as a command.

I added a file in etc/paths.d that consists of usr/texbin, and when I type echo $PATH, usr/texbin appears, so that's not the problem, I don't think.

Any advice that anyone can give to get bibtex working by command line (since I don't know of any other way to use it) would be greatly appreciated. Thanks.