tshaw@hp7900-czc9080ttx:/$ ruby
-bash: /usr/bin/ruby: No such file or directory
tshaw@hp7900-czc9080ttx:/$ which ruby
/usr/local/bin/ruby
tshaw@hp7900-czc9080ttx:/$ echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games
tshaw@hp7900-czc9080ttx:/$