On the eve of the start of the course " Administrator Linux. Professional " we have prepared an article by Alexander Kolesnikov. If you are interested in learning more about learning on the course, come to the demo day of the course.
Hardening
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echo $RANDOM % 5 + 1 | bc
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nmap -n -A -p- --max-rate=1000 machine.ip.address
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netstat -tulpn
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dirb http://machine.ip.address
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"Administrator Linux. Professional"