The best tips for Linux distributions including Ubuntu and CentOS.
In Linux, every file and directory has an associated set of permissions. These permissions determine who can read, write, or execute the file or directory. Using the chmod command is a fundamental aspect of Linux and Unix-like operating systems. Understanding Linux permissions is crucial for system security and data integrity. Proper permission settings prevent unauthorized … Read more
Shell scripting is a powerful programming method used to automate tasks in Unix and Linux systems. An integral part of shell scripting is the ‘sleep‘ command, often used to pause the execution of a script for a specified amount of time. Its usage helps manage system resources better and control script execution flow. Understanding Sleep … Read more
Introduction to Bash Bash, or Bourne Again Shell, is a command interpreter and a well-admired Unix shell introduced by the GNU Project. Bash allows users to type text-based commands, which it interprets to perform a wide variety of tasks such as executing programs, manipulating files, and handling system operations. It’s popular due to its versatility … Read more
I. Introduction A Linux lightweight distro refers to a Linux operating system that is built to be minimalistic and uses fewer resources than conventional ones. This provides numerous benefits, including faster boot times, less disk space usage, and improved system performance, particularly on older hardware. This article will delve into the world of Linux lightweight … Read more
Today, let’s delve into how to initiate the SSHD service in both Solaris 10 and Solaris 11, two widely utilized versions of the Solaris Operating System. With the right steps, you’ll be able to restart SSH service in Solaris easily. Lets jump right in… Step 1: Ensure Installation Before we can restart SSH service, we … Read more
Command-line parameters are an efficient way to control the behavior of your shell scripts. They can make your scripts more dynamic, easier to use, and more powerful. In this blog post, we will delve into five ways you can pass command-line parameters to a Linux shell script. First, a little about various Linux Shells… Linux … Read more
You will learn how to manage dependencies during RPM installation on Linux servers such as CentOS, RHEL, Fedora, and Ubuntu. We’ll provide step-by-step instructions on how to properly handle dependency issues and solve common issues. Whether you build your own RPM or use third-party, we’ll cover it in this guide. About RPM and Dependencies Each … Read more
Discover how to build RPM packages on Ubuntu, CentOS, Fedora, and Red Hat. Follow our step-by-step guide to mastering RPM creation easily. RPM Package Manager, commonly known as RPM, is a versatile open-source package management tool that provides a simple way to build, install, verify, update, and uninstall software packages. This article guides you through … Read more
If you are a Linux user, understanding how to append files in Linux is an essential skill that will undoubtedly prove useful in various scenarios. The term ‘append’ in computing means to add or attach something at the end. In Linux, it specifically refers to adding data to the end of a file. This article … Read more
Here is a simple script that utilizes xentop to monitor your Xen server. You can schedule this via cron to run every X minutes to track the load average and if gets too high, it will email you (be sure you change your-emailid to your actual email address) #!/bin/bash loadavg=`uptime | awk ‘{print $10}’` process=`nproc` … Read more
Here is powerful and simple use for the Linux find command – finding files or folders by one or more groups. Let’s get right onto the examples: Find files by group students find -type f . -group students Find folders/directories by group students find -type d . -group students Find files by groups student and teachers find -type … Read more
The find command in Linux/Unix is extremely powerful and can take some time to learn all of its uses. In previous articles, we have explained how to it to find files greater than or less than a certain size, find number of files in a folder, and finding the largest files on your computer. This article … Read more
While using the bzero() function you may have run into the message warning: incompatible implicit declaration of built-in function ‘bzero’. The solution for this common, annoying, message is straightforward. Simply include the header file <string.h> and the warning will go away! What is bzero? bzero() is a function in C and C++ programming languages, commonly used in … Read more
Since you stumbled on this article, you must already be aware of the Heartbleed security vulnerability that affects a large number of internet websites. The target audience for this article is to administrators of Dedicated servers on Hostgator or any other provider. Identify if your server is affected by Heartbleed Visit the detection tool website … Read more
In a previous article, I showed you how to append a string to the end of file. Now I will show you how to insert a string to the beginning of a file in Linux. The solution is not as obvious as the former, but I will show you a quick and easy way using … Read more
If you are looking for a quick and easily solution to changing your Linux passwd from a script, you have come to the right place. As you already know, the passwd command prompts the user to enter the desired password as well as a confirmation, but I have a solution that will change the password … Read more
This article will go through some basic examples on how to list files above or below a certain size in Linux using the find command. There are many use cases for running queries like this, for instance finding small files on your hard drive or finding very large files. So, lets get started with some examples. Using find … Read more
I am running Ubuntu 11.04 and was trying to install the Java OpenJDK 6.0 (and 7.0) on my system but I received the following error: Unable to fetch some archives, maybe run apt-get update or try with –fix-missing? I tried installing several different Java packages but all of them failed with the same error. Finally, … Read more
Have you tried doing yum install ruby in CentOS 5.5? If you have the default repositories configured, you will notice that it installs the ancient Ruby 1.8.5. Not ready to move up to Ruby 1.9, but would like to install Ruby 1.8.7 – well here is how to do it! Install Ruby 1.8.7 on CentOS … Read more
When you login (via SSH or other method), to a Linux box, you will see a Welcome message that displays your Last Login time and date as well as other general information regarding the system. Here is an example: Linux sp-ubuntu 2.6.35-24-generic #42-Ubuntu SMP Thu Dec 2 01:41:57 UTC 2010 i686 GNU/Linux Ubuntu 10.10 Welcome … Read more
This seems like a pretty simple piece of information to ask for, but then why is there no intuitive way for Linux novices to accomplish this? In Windows command-line, the output of the dir command includes the number of files and the number of folders in the current directory. Well, here are some ways you … Read more
Are you looking for a fast, easy, and free way to convert a PDF document to a plain-text .txt format? Luckily, there is a built-in program in most Linux distributions that can do this called pdftotext. To convert, simply do: pdftotext -layout filename.pdf filename.txt
Do you need an ultra fast way to create a large number of files in Linux? Perhaps, you are doing some load testing for an application and you need to create 1000 or even 1,000,000 files in the matter of seconds. Well, here is how to do it! There are two parts to creating these … Read more
This article will show you how to use the head command in Linux. head is used to print out the beginning of a file. For example, this is useful when you have a giant text file and you want to preview the contents without attempting to open the entire file. Here are some common examples … Read more
This article will show you how to add a network printer on a Ubuntu 9.10 system. Let’s go ahead and get started… Navigate to System –> Administration –> Printing Then choose Server –> New –> Printer from the Printer configuration window The New Printer wizard will be displayed. Here you can add either local or … Read more