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Unfortunately you can't unless you have a backup to restore.
Unlike DOS/Windows the Unix/Linux OS assumes you mean what you type so won't ask you if you're really really sure before it does what you tell it. Files deleted are actually deleted so there is no undelete feature.
Well, speaking as someone who uses reiserfs and ext3, there's at least 2 other good things to learn from this:
- Test out a command that deletes files with ls first to see if it's what you want to do (not always possible, but a good way to make removing files a deliberate action; and
- Backup your system and your data even more regularly than you think you need to.