> which is for csh users.  it isn't for anyone else.  that's just how
   > it is.
   
   Hmm, maybe the which(1) man page should be tweaked a little to make it
   really clear that people not using csh should instead use alternatives
   such as whence.
   
   I just popped out to look at the 1.4U which(1) man page and it has some
   really terse bits about "csh only" that are not clear; they seem to
   be explaining that which is a csh script, not that it is useless for
   non-csh-users.

this is probably the best way to avoid future issues with it.