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Don't panic over new Linux exploits: How to check if your PC is affected in under 5 minutes

Instead of guessing about security alerts, learn how to confirm your system status using the tools your distro already ...
Ars Technica

[SOLVED] Check Linux version w/o lsb_release

Is there a way to check a distro release version if lsb_release isn't available? I think that it's RHEL 4.x, but I need to verify.