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today's howtos

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HowTos
  • What are Bash Environment Variables

    In computing, variable is a term that can be used to assign it any value or to use the variable dynamically in accomplishing the specific task. For instance, programmers declare variables by any symbol (alphabetical letters mostly) and can be used to act as a different value in several programs. Our operating systems have a list of variables that are used to manipulate the programs or processes in a computer and are known as environment variables. These variables reside in every kind of OS and can be handled (create, edit, delete,) as like other variables in a PC. Like other operating systems, Linux also has environment variables, and these variables are used in several scripts and programs within the Linux environment. Contrary to these environment variables, a variable type named as shell variables also exists in Linux, but they are active in the current instance of the shell, once the shell environment is terminated the shell variable is also washed out. In this guide, we will briefly explain the bash environment variables: Before a deep insight let’s go through the basics of environment variables:

  • How to Install & Use ClamAV on AlmaLinux 8 - LinuxCapable

    ClamAV is an open-source and free antivirus software toolkit able to detect many types of malicious software, including viruses, trojans, malware, adware, rootkits, and other malicious threats. One of its main uses of ClamAV is on mail servers as a server-side email virus scanner or used on file hosting servers to periodically scan to make sure files are clean, especially if the public can upload to the server.

    ClamAV supports multiple file formats (documents, executables, or archives), utilizes multi-thread scanner features, and receives updates for its signature database daily to sometimes multiple times per day for the latest protection.

    In the following tutorial, you will learn how to install and use ClamAV on AlmaLinux 8.

  • Sleeping and waiting on Linux | Network World

    The Linux sleep and wait commands allow you to run commands at a chosen pace or capture and display the exit status of a task after waiting for it to finish. Sleep simply inserts a timed pause between commands. Wait, on the other hand, waits until a process completes before notifying you that it has finished.

  • Can Prometheus Monitor Network Devices

    Most of the network devices support the SNMP (Simple Network Management Protocol) protocol. You can use the Prometheus snmp_exporter to monitor SNMP-supported network devices with Prometheus and Grafana.

    In this article, I will show you how to monitor the network of a home router (TP-Link Archer C5 V4) with Prometheus and Grafana. So, let’s get started.

  • SSH Authorized Keys Example Usage

    SSH (Secure Shell) is a protocol used to remotely and safely (encrypted) access systems. The SSH server runs on the remote machine, and the SSH client on your working machine. Communication between client and server is typical via the command line. Now, there are several ways of authenticating the connection – password authentication, public/private key-based authentication (using the authorized_key file), and host-based authentication (using the known_host file).

  • Create a New DataFrame From an Existing DataFrame in Pandas?

    Sometimes, we need to copy the existing DataFrame with data and indices. However, copying the whole DataFrame is also another way for there to be a direct relationship created between the old DataFrame and the new DataFrame. If we make any changes in the old DataFrame, it will also affect the new DataFrame or vice-versa.

    In this article, we are going to see pandas.DataFrame.copy () method, which is used for copy () dataframe.

    If we want to create a new DataFrame from an existing DataFrame, then we can use the copy()method. So, in this article, we are going to see how we can use the Pandas DataFrame.copy() method to create another DataFrame from an existing DataFrame.

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