PHP web applications are one of the most commonly attacked pieces of software on the Internet today. Anyone who has looked at their web server logs can attest to the frequency of probes for vulnerable PHP applications. PHP's easy learning curve has lead to its popularity and breadth of applications, but not without some hard learned lessons on the way. This document serves as a reminder of some of the important security related issues when programming in PHP. The paper is not a security manual.
This small tutorial describes how you can get rid of the -- MARK -- message on Debian GNU/Linux in the message log.
https://unixsheikh.com/tutorials/remove-mark-from-the-message-log.html
This tutorial describes how you can keep the system time precise using a NTP server. https://unixsheikh.com/tutorials/keeping-the-system-time-precise-using-ntp.html
This tutorial describes how you can speed up DNS requests using BIND as a local cache. https://unixsheikh.com/tutorials/cache-your-dns-requests.html
How to encrypt and decrypt a file with GnuPG, OpenSSL or LibreSSL, or Mcrypt using the Advanced Encryption Standard and a password phrase. https://unixsheikh.com/tutorials/encrypting-and-decrypting-files-using-gnupg-openssl-or-mcrypt.html
In the world of Linux (also called GNU/Linux) there currently exist over 600 distributions, approximately 300 of those are in active development, constantly being revised and improved, and while most of them look great, only a few of them are actually worth paying attention to IMHO. https://unixsheikh.com/articles/why-i-do-not-like-derived-linux-distributions.html
