Quick message - This link is broken

Hi,

I noticed a link on your site which is no longer working; It's on this 
page: http://manual.phpv.net/pear/cn/core.pear.system.system.which.html 
, I’m getting an error when I visit this link: 
http://unixhelp.ed.ac.uk/CGI/man-cgi?which

If you are planning on updating this page on your site, perhaps our 
guide to Unix Programming resources - http://wiht.link/unix_programming 
would make a suitable replacement.

-Tom