As this seemed to be a useful post on my old blog I am reposting it. Just in case the $PATH terminal variable gets corrupted, for MAC OS X 10.5. 10.6.

export PATH=/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin

to add to you path

export PATH=$PATH:/usr/local/sbin:/usr/local/bin