linux 🍹

A collection of 58 posts

how to 🪄

Using Monit to Monitor Linux Daemon, CPU, Filesystem, Network and Files on Ubuntu Server.

Services on any server must be operational and perform their duties effectively. It is critical to monitor the overall state of your server, including processes, programs, directories, files, and so on. This is known as system monitoring.

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Running commands over SSH.

Have you ever wanted to send a command or a script to a remote computer without ever actually logging in to the shell? - well, SSH (Secure Shell) is your friend. Let's say you would like to check your server process activity by using the "top"

linux 🍹

Understand the /etc/passwd file.

The /etc/passwd file is used to keep track of every registered user that has access to a system. In other words, it stores user account information.

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Working with pipes || on Linux.

No, no, nooo... not the PVC one!!! ... but this command-line pipe is just as useful, and its hold a ton of value for system administrators. The | command is called a pipe. It's a form of redirection in Linux used to connect the STDOUT of one command into the STDIN of a second command.

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passwd Command.

Both Linux and UNIX-like (UN*X) operating systems use the passwd command to change user's password. The passwd is used to update a user’s authentication token (password) stored in /etc/shadow file. The passwd change passwords for user and group accounts.

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Install & Use Glances to monitor Ubuntu Server.

Whether you're a system administrator or a casual desktop user, you've probably heard of the most popular terminal-based system monitoring tools, TOP, and its colorful, feature-rich cousin-in-law HTOP. 😬😅

how to 🪄

Edit /etc/hosts in Linux.

The hosts file is a local file or local DNS system that contains a static table lookup for hostnames and IP addresses. It is used to map domain names to IP addresses and can also be used as an alternative to DNS. It is available in all operating systems, including Windows, Linux, and macOS.

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How to resolve LAN hostnames on Ubuntu Server.

Although we are accustomed to using names (i.e, www.snubmonkey.com) when surfing the Internet, the Internet is pretty much based on numbers known as IP addresses.

security 🦾🦿

Security Auditing on Ubuntu Server using Lynis.

Lynis is a free and open source host-based auditing tool for UNIX-like operating systems. It scans the system for security information, general system information, configuration mistakes, security issues, user accounts without a password, wrong file permissions, firewall auditing, and so on.

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Aliases explained ...

Do you often find yourself typing long commands on Terminal or searching in the history for a previously typed command? If you do, then you will find aliases super, super handy. Bash aliases allow you to set a memorable shortcut command for longer commands.

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How to remove PPA repositories on Ubuntu Server.

Whenever you want to install a software package to your Ubuntu system, you first refer to the official Ubuntu repository listed in your system’s sources.list file. If the software is not available there, you can install it through any PPA repository it is available on.

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Setup/ Change Timezone on Linux.

System’s timezone usually sets up your Linux system to fetch Time Zone automatically; it will sync your system through the internet so that it will have the time zone of your closest location.

linux 🍹

SCP Command on Linux Systems.

SCP (Secure Copy Protocol) is a command-line tool in Linux and Unix-like (UN*X) systems that is used to transfer/ copy files and directories across the systems in a secure way over the network.

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How to Change or Set Hostname on Ubuntu Server.

The hostname is what a device is called on a network. The hostname is used to distinguish devices within a local network. In addition, computers can be found by others through the hostname, which enables data exchange within a network.

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Rename or Change User Name and UID on Linux Systems.

You might have come across a situation where you want to rename a user name in Linux system, for whatever reasons. In this short tutorial, we will be discussing how to change user name (rename user name) or UID under a Linux operating system using command line tools.

linux 🍹

Deadly Commands You Should Never Run on *nux Systems ☠️

Whether you're a Linux newbie or veteran, you should never run a command unless you know exactly what it does. Linux can be a double-edged sword. It assumes that you know what you're doing and gives you the freedom to do whatever you want.

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Three ways to Lock and Unlock accounts on Linux Systems.

One of the most critical part of any administrator is the ability to manage user accounts. In the following article, we are going to illustrate the different ways in which a user account can be locked and unlocked in a Linux system.

linux 🍹

Chmod +rwx Command on Linux Systems. (Permissions)

In Linux and Unix-like (UN*X) operating systems, a set of flags associated with each file determines who can access that file, and how they can access it. These flags are called file permissions or modes, as in "mode of access."

linux 🍹

Soft and Hard links on UN*X System.

Hello curious people. In this intro. to hard links and symbolic links, we will first learn and define what each one means. Then we will discuss how do they differ.

linux 🍹

The famous SUDO command on Linux Systems.

Sudo stands for SuperUser DO and it allows you to run programs with the security privileges of another user (by default, as the superuser or the root user). It prompts you for your personal password and confirms your request to execute a command by checking a file, called sudoers.

linux 🍹

Introduction to hashing and checksums on Linux Systems.

Have you ever heard or wondered how to make use of a checksum - Here is an introduction that shows you what is it, and how to use the proper tools to verify the integrity of a file.

how to 🪄

How to Kill user tty/pts sessions on Linux Systems.

Unix login session can be killed remotely by sending a hangup signal (SIGHUP) to the process running the login session. In this How2, we will dig further into it and explain the command-line option to kill unwanted or unused or idle ttys.

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How to Redirect HTTP to HTTPS in Nginx.

Today, we will explain how to redirect the HTTP traffic to HTTPS in Nginx. How we can secure our website by redirecting all unsecured traffic on port 80 to SSL secured port 443.

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How to mount USB drive on Linux Systems.

Today tutorial will explain how to mount USB drive or a regular SATA drive in Linux system using terminal and shell command line.

linux 🍹

Behind the Scenes: SMTP Server.

Is send emails difficult? From a client's viewpoint, everything looks very straightforward. Under the hood, it is nothing else, complex system that drives messages from the sender to the recipient. Today, we'll be talking about a concept related to an outgoing mail server, known as an SMTP server.