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Articles by Satish Kumar
Page 25 of 94
Remove the First Line of a Text File in Linux
There are several ways to remove the first line of a text file in Linux. In this article, we will explore four different methods that can be used to accomplish this task, each with its own advantages and syntax. Method 1: Using the head Command The head command displays the first few lines of a text file. To remove the first line, we use the -n option with a negative value. The -n -1 option tells head to display all lines except the last one, which effectively removes the first line when we want all but the first. ...
Read MoreARM calling conventions on WinCE and Linux
The ARM processor architecture has become increasingly popular in embedded systems and mobile devices due to its low power consumption, high performance, and cost-effectiveness. It is widely used in operating systems such as Windows CE and Linux. This article discusses ARM calling conventions on these two platforms. What is a Calling Convention? A calling convention is a set of rules that dictate how function calls are made in a program. These rules define how arguments are passed, how return values are handled, and how the stack is managed during function calls. Several different calling conventions exist for ARM ...
Read MoreHow to find number of RAM Slots in Linux
Random Access Memory (RAM) is an essential component of any computer system that stores data the processor uses frequently to speed up program execution. Since the number of RAM slots determines the maximum amount of memory that can be installed, knowing how many slots are available is crucial for planning memory upgrades. This article demonstrates three methods to find the number of RAM slots in Linux systems. Why Know the Number of RAM Slots? Understanding your system's RAM slot configuration is essential for several reasons. The amount of installed RAM determines how many programs can run simultaneously and ...
Read MoreThe netcat Command in Linux
The netcat command in Linux is a powerful network utility for communication and troubleshooting. It allows users to read and write data to network connections using TCP or UDP protocols. Often called the nc command, netcat serves as a versatile tool for establishing connections, transferring files, port scanning, and network debugging. What is the netcat command? The netcat command, also known as nc, is a command-line utility that enables reading and writing data over network connections. It can establish connections to servers and clients, send and receive data, and perform various network-related tasks. Network administrators commonly use it ...
Read MoreWhere is entry of hypercalls in KVM
Kernel-based Virtual Machine (KVM) is a virtualization infrastructure for Linux that allows multiple operating systems to run simultaneously on a single host machine. It leverages hardware virtualization support, such as Intel VT-x and AMD-V, to provide efficient virtualization. A critical aspect of KVM's operation is how virtual machines communicate with the hypervisor through hypercalls. What Are Hypercalls A hypercall is a privileged instruction that allows a virtual machine to interact with the hypervisor — the software layer controlling access to physical hardware. Similar to system calls in non-virtualized environments, hypercalls enable virtual machines to request services such as ...
Read More10 Interview Questions on Linux ls Command
If you're looking to land a job in a Linux environment, you're likely to be asked a lot of technical questions during the interview process. One of the most important commands in Linux is the ls command, which is used to list the contents of a directory. In this article, we'll explore the most common interview questions on the ls command and how to answer them effectively. What is the "ls" command, and what does it do? The ls command is used to list the contents of a directory. It displays the names of files and directories in ...
Read MoreFind and tar Files on Linux
One of the most powerful features of the Linux operating system is the ability to find and manipulate files quickly and easily from the command line. This can be especially useful when working with large numbers of files or when you need to automate certain tasks. In this article, we will explore two essential command-line tools for finding and compressing files on Linux: the find command and the tar command. Finding Files with the find Command The find command is a powerful tool that allows you to search for files on your Linux system based on various criteria ...
Read MoreLinux per-process resource limits - a deep Red Hat Mystery
Per-process resource limits in Linux are constraints that prevent individual processes from consuming excessive system resources like CPU time, memory, and file descriptors. These limits ensure system stability by preventing resource starvation and maintaining fair resource allocation among competing processes. Red Hat Enterprise Linux provides multiple mechanisms for implementing these limits, including traditional ulimit commands and the more advanced Control Groups (cgroups) framework. Understanding both approaches is essential for effective system administration. What are Per-Process Resource Limits? Per-process resource limits are system-enforced boundaries that restrict how much of a particular resource a process can consume. When a ...
Read MoreLinux ping Command
In the world of networking, the ability to check if a networked device is reachable is a basic requirement. One of the tools that can help us achieve this is the ping command. The ping command is a tool that sends a signal to a specified networked device, and then waits for a response. The ping command is available in almost all operating systems, including Linux. What is ping Command in Linux? The ping command in Linux is a utility that helps to test connectivity between two devices on a network. The ping command sends a request to ...
Read MorePreserve Bash History in Multiple Terminal Windows on Linux
Bash history is a powerful tool that can help you keep track of all the commands you've executed in your terminal. It can be especially useful when you're working with multiple terminal windows, as it allows you to easily switch between them and pick up where you left off. In this article, we'll show you how to preserve bash history in multiple terminal windows on Linux, and explain why it's so important. Why Preserve Bash History? Preserving bash history is important because it allows users to easily recall commands they have previously executed in the terminal. This can ...
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