Ar an 2ú lá de mí 5, scríobh Jim Bernard :

 >   That depends on what answer you're seeking.  Which can actually be handy
 > in the specific case that you are _not_ using csh, if you already know that
 > foo is, say, a shell function that eventually executes some program named
 > foo that is found in PATH, and you want to know "which version of that program
 > is ultimately going to be executed when I type foo?"  (A better solution is
 > "whereis -p", but that's not portable, and it's easier to type "which".)

If you're using zsh, which(1) is a builtin, so that's not portable to all
the Bourne shells either. 

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