How to

fortune is a simple program that displays a pseudorandom message from a database of quotations that first appeared in Version 7 Unix. The most common version on modern systems is the BSD fortune, originally written by Ken Arnold. Distributions of fortune are usually bundled with a collection of themed files, …

This is an unusual situation and a misconfiguration on DNS servers that can be exploited using a simple AAAA DNS query. This causes a localized Denial-of-service situation where users behind a specific resolver will get: Error: Unable to determine IP address from host name www.somevulnerablesite.com The DNS server returned: Name …

Many Linux systems, servers and VPS’s run on low memory and over time you will see a degradation of speed and responsiveness. By default, Linux got excellent Memory Management and it knows when to clean up cache to free up enough Memory to execute the next command. However, saying that, …

This is a pesky and annoying problem. I often lock my Kali workstation and when I try to log back in the next time, the resolution changed to 640x480 instead of my standard resolution of 1280x1024. This is very simple way without changing any system files for fixing resolution problem …

bash history command is very useful. It gives you an complete view of what commands you ran. By default bash  historycommand will give you all your previous commands with Line numbers. It’s the default behavior. However when you’re trying to copy-paste those commands again, you have to manually remove those …