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rm -rf is gone

It looks like you cannot run rm -rf as root on CentOS or RHEL6 boxes.

# cat /etc/redhat-release 
CentOS release 6.5 (Final)
# rm -vrf /               
rm: it is dangerous to operate recursively on `/'
rm: use --no-preserve-root to override this failsafe

Don’t try this on a RHEL5 boxes.