> Sorry, read "Which also works..." as "'which' also works...is required
> by posix."

You weren't the only one :-)

I guess it is my fault for not realising that 'Which' could be mistaken
for 'which' when I wrote the earlier sentence.

I know that 'command -v' is required by POSIX because I sat and implemeted
it [1] for netbsd's /bin/sh - it was a right pain to get anywhere near
right.

	David

[1] it isn't quite right due to the way netbsd's /bin/sh works...
Doing it 'properly' would add a significant cost to calling many shell
builtins.

-- 
David Laight: david@l8s.co.uk