Dave Huang said:

>But it's been a csh builtin since the 4.4-Lite merge, over 8 years
>ago... I don't see any need for which(1) anymore--it only works
>properly for csh-like shells, and those already have a builtin "which."
>Other shells have their own way of determining what'll run when you
>type a command.

I've been using which(1) (/usr/bin/which) on a daily basis for around
23 years. I currently use ksh as my shell. There is no builtin which 
in ksh or sh.

Just about all BSD and SVR4 derived UNIX systems have which.

-- 
Rick Kelly  rmk@rmkhome.com  www.rmkhome.com