[X-Unix] setenv missing!

[Ben Gold]

My setenv command appears to be missing.  When I try to use it I get:

-bash: setenv: command not found

It may have occurred after the 10.4.1 update, not sure.  The last  
thing I used it for was toggling the open-firmware security level.

My $PATH seems fine, does anyone know where setenv resides and/or  
have any guesses why it might go missing?

PS: a brief review seems to show other commands (that I use at least)  
are present and working

-Ben