Did a similar thing - only much worse...
Had a dual-boot Slackware/M$ machine and installed RedHat on a spare partition (to see if RH was any good) - decided to get rid of RH, so went to root of the RH filesystem and did "rm -r *".... and THEN realised that the other filesystems were mounted under the RedHat one... lost all 3 OSes with one command!!!
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Did a similar thing - only much worse ...
Had a dual-boot Slackware/M$ machine and installed RedHat on a spare partition (to see if RH was any good) - decided to get rid of RH, so went to root of the RH filesystem and did "rm -r *" .... and THEN realised that the other filesystems were mounted under the RedHat one ... lost all 3 OSes with one command!!!