today's howtos

posted by Roy Schestowitz on Jan 02, 2023

• How to Get User ID (UID) in Ubuntu Command Line

  User ID (UID), is nothing but a numeric value defined by your system to identify the users.

  And if your system is running with multiple users, UID can be handy when you want to manage them.

• Check If You Are Using SystemD or Not in Linux

  This article will show you three methods for determining whether your Linux system is using systemd or another init system.

  If you are unfamiliar with this term, check the following section; otherwise, skip to the next section.

• Controversy of ‘init’ and ‘systemd’ in Linux

  The init (short for “initialization”) is the first (or parent) process loaded by your kernel that swamps other (child) processes to make your system work in a systematic manner, and it is assigned with “PID=1” (process identifiers are assigned in sequential order).

  As this is the parent of all processes, it has the responsibility to keep running until the user sends a halt signal; otherwise, you might experience the stage called “Kernel Panic”.

  When you hear the term “init” in conjunction with it, you will also hear the term “System V init”, which is essentially the first commercial system designed based on init, which many future Linux distributions adopted (until systemd came).

  The init is respected for many things, but for now I’ll focus on one major one: “Do one thing and do it well”. This referred to the init behavior of starting one process after the previous one had completed in serial.

• HTTP request case sensitivity

  I only recently learned that HTTP methods are case-sensitive. In order to save myself from future debugging headaches, I decided to do a quick search to see what else is case-sensitive.

  This is what the RFC says. Real applications may treat things differently!

• Visual guide to SSH tunneling and port forwarding

  SSH tunneling and port forwarding can be used to forward TCP traffic over a secure SSH connection from the SSH client to the SSH server, or vice versa. TCP ports or UNIX sockets can be used, but in this post I'll focus on TCP ports only.

  I won't go into details, but the following post should show enough examples and options to find use in your day-to-day work.

• How to List Current Logged-In Users on Linux

  Linux being a multi-user system allows multiple users to log in and run various programs at the same time. As a normal Linux user or system admin, you may sometimes need to check which users are currently logged into your system.

  This information can be useful for various reasons such as for troubleshooting performance issues, monitoring user activity, or for simply checking who else is using the system.

• Make Ubuntu Terminal Look Like Kali Linux [2023] | Itsubuntu.com

  In this Ubuntu Tutorial Post, we will help you to make your Ubuntu terminal look like Kali Linux. Ubuntu is a popular Linux-based operating system and is most preferred by beginners while Kali Linux is popular for security purposes.