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login

TRON: Legacy

In the movie TRON: Legacy, Linux is rebranded "SolarOS" in reference to Solaris, another Unix OS


Start the VM to boot the previously installed Debian system.

Do the following for both a user and the superuser (root) :

  • Log in
  • Clear the console using the keyboard shortcut
  • Change the password to a space : " "
  • Show the command history using five keystrokes or less (using autocompletion)
  • Log out using the keyboard shortcut

Just numbers

Login as root on the third Linux console.

Check the Internet connectivity with the command ping google.com. After a few hops, interrupt the program with : Ctrl + C.

Behind every name in a computer system there is a number (ID, index, address, etc) :

  • User identifier
    • root0
    • student1000
  • IP address
    • google.com → 216.58.214.14 (quad-dotted notation) → 3627734542
    • tencent.com → 117.169.101.44 (quad-dotted notation) → 1974035756
  • File inode
    • /etc/fstab44696029
    • .profile59639363
  • Port
    • HTTP80
    • HTTPS443
  • Process identifier
    • cron254

Names exist because they are human readable, but behind the scenes they are converted into numbers, unique in their namespace :

  • A domain name can have several IP addresses, but an IP address can only identify one domain name
  • Several processes may have the same name, but a PID identifies a single process

Find the commands to get :

  • the inode of a specific file
  • the current user ID
  • the PID of a program, for example bash