The Most Dangerous Linux Commands
About this video
The creator demonstrates Linux commands he says can destroy a system, testing them on an Ubuntu virtual machine so viewers do not try them on their own machines. He explains sudo rm -rf /* in detail: rm removes, -r deletes recursively, and / starts at the root of the filesystem, so the asterisk version bypasses the no-preserve-root failsafe and deletes everything, leaving the GUI and commands unusable with no recovery. He then shows the same command inside the Guest Shell Linux VM on a Cisco CSR 1000V router in GNS3, noting it destroys the guest shell, not the router IOS configuration, and warns that a downloaded malicious bash script run with wget could change or bring down router interfaces. Other attempts he tries — an encoded rm -rf, writing directly to the hard drive, and overwriting it with random data — largely fail or do nothing visible. A fork bomb, a function that repeatedly copies itself, does freeze the terminal by exhausting CPU and memory. Throughout, he stresses backups, showing Synology Active Backup for Business backing up his ESXi VM and doing an instant restore to a Synology hypervisor.
Key takeaways
- sudo rm -rf /* recursively deletes from the filesystem root and is unrecoverable without a backup
- The asterisk bypasses the no-preserve-root failsafe that blocks the command without it
- A fork bomb can denial-of-service your own machine by exhausting CPU and memory
- Running untrusted downloaded bash scripts can damage a system or router configuration
- Regular scheduled backups and tested restores are the main protection presented
Episode details: published September 6, 2019 · 22:16 long. Summary written by Self Growth Videos from the episode itself. Business results and any income figures mentioned are NetworkChuck’s own claims, shared for education — they are not typical or guaranteed.
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