http://www.securitronlinux.com/uncategorized/tron-legacy-unix-operating-system/. As seen in this posting above, the Tron Legacy movie used computers with a variant of the Solaris UNIX operating system. The ps -ef command works in the FreeBSD UNIX distribution, you need to mount procfs with this command: mount -t procfs proc /proc this will enable the proc file-system. The login -n root command does not work as shown in the movie on FreeBSD, but the command login root does work, when executed as your normal user, you can switch to the root account with this command, just like using su. I am not sure what operating system the original computers in the Tron movie used, but the computers in the sequel were definitely running a Solaris UNIX operating system. This movie was not too bad at all, the new special effects were pretty good, but the light bike action was not the same as the original game which was on a flat grid, this was on an undulating field instead.