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Serious Privilege Escalation Bug in Unix OSes Imperils Servers Everywhere

“Stack Clash” poses threat to Linux, FreeBSD, OpenBSD, and other OSes. A raft of Unix-based operating systems—including Linux, OpenBSD, and FreeBSD—contain flaws that let attackers...

Two Factor Authentication – Best for the UNIX/Linux Server Security

The UNIX/Linux server security is challenging because these servers are at a risk of getting compromised at any point of time by the attackers....

The Beauty of Links on Unix Servers

Symbolic and hard links provide a way to avoid duplicating data on Unix/Linux systems, but the uses and restrictions vary depending on which kind...

Nine Ways to Compare Files on Unix

Sometimes you want to know if some files are different. Sometimes you want to how they're different. Sometimes you might want to compare files that are...

How to Learn Unix/Linux

Every month or two, someone asks me how they should go about learning Unix. The short answer is always "use it" or maybe as...

How to Password Protect a Folder on Linux/Unix without Encryption

As operating systems, Linux/Unix put the user's privacy and safety above all. While this has resulted in a product that many people swear by,...

‘You are Not Expected to Understand This’: An Explainer on Unix’s Most Notorious Code...

The phrase “You are Not Expected to Understand This” is probably the most famous comment in the history of Unix. And last month, at the Systems...

How Fast Are Unix Domain Sockets?

It probably happened more than once, when you ask your team about how a reverse proxy should talk to the application backend server. “Unix...

Chrooting Apache 2.4 with mod_unixd on Debian 8 (Jessie)

This guide explains how to set up mod_unixd with Apache on a Debian 8 system. With mod_unixd, you can run Apache in a secure...

14 tail and head commands in Linux/Unix

Many people know about cat command which is useful in displaying entire file content. But in some cases we have to print part of...