Terminal- Wrong command.

Question

Earlier today I was trying to force-delete from my trash. But instead of
rm ~/.Trash/*
I typed in:
rm -rf ~/.trash /*
What happened next scared the lights out of me. It seemed that it was trashing everything/deleting everything but luckily most of the lines have said at the end  "Permission Denied"
After that I checked my finder to see if my files and downloaded apps were still there, my finder for once, didn't know the size of any. But after a while it did.
Here's a 1/1500 of what happened in terminal.
Please, Answer quick
-Classified

Answer 1

Having put a space before "/*" directed the command to erase all files on your startup volume. Without the "sudo" command all system files would return the Permission Denied error. However, to be on the safe side I think you should reinstall Lion:
Reinstalling Lion/Mountain Lion Without Erasing the Drive
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.
Reinstall Lion/Mountain Lion: Select Reinstall Lion/Mountain Lion and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.