Thanks in advance and you CAN stop laughing now by the way...
No laughing, really, I had shutdown
lost when I first tried RedHat, too. Probably it's just not in your $PATH, so you'll need to run it with full path:
might help. If you still can't found it, try
Halt command will halt your pc, but not turn the power off unless ACPI (or something else) is handling the power cutting. Older computers, I remember, didn't turn off automatically, Windows 95 for example just showed a "You can safely shut pc down" -type message after which user had to press the button. Nowadays automatic power management things handle that so that when an operating system wants the power to go down, the machine can do it. See if you have acpi loaded and enabled, firstly.