On Debian 6, I uninstalled Ruby 1.8 and installed 1.9.1. Now if I run which ruby it doesn't output anything. Why can't it find ruby anymore?
Why doesn't 'which ruby' output anything?
debian;ruby
Look for it:find / -name ruby 2> /dev/nullIf you get a positive location, make sure that the directory is in your $PATH. If you don't get any output, your Ruby installation didn't go as planned.