Pls. what does this command mean?

sudo rm -rf /System/Library/Extensions/IOPlatformPluginFamily.kext
Someone left a post on another site and claims this will stop the whine on the MacBook Pros.
Okay, I got desperate, I pasted it on my terminal and rebooted as indicated and the whine is gone. I had the high pitch whine when running on battery only.
If this is bad, how do I reverse it? Did it correct the problem or did this command mask the problem? If so, can someone let me know how to reverse it? Thx
MBP 15" 2.0   Mac OS X (10.4.7)  

Thanks for the responses.
Yes, it was dumb to do that. Luckily, there are people out there that are not maliclious but he/she should of indicated that I should save the file first.
Go figure, I find this same revelation else where including the 'save' requirement, after the fact.
I did however recover the file that I deleted and the whine is back, thanks to Niel's suggestion. Nice program.
Temperature Monitor was showing Core's at 72 C and now both at 54 after reinstalling the deleted file. The MBP was running very hot which bothered me although the whine did disappear but I was afraid of what this heat would do to its innerds if it continued.
I've only had the MBP for 3 days and am torn if I should return for a refund and wait or live with the whine and use QuietMBP or Photobooth.
Well, I'll play some more and decide by Friday.
Cheers all.
MBP 15" 2.0   Mac OS X (10.4.7)  

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