Popular video tutorials for getting started with Linux systems

sblk is a command used to list all available block device information in a Linux system. Block devices refer to devices that can transmit data in blocks, such as hard disks, optical drives, USB flash drives, etc. The lsblk command can display the dependencies between block devices, as well as various attributes such as size, type, file system, mount point, etc. The lsblk command obtains information from the /sys virtual file system and udev database. If there is no udev database or lsblk is not compiled with udev support, then it will try to read the label, UUID and file system type from the block device, which requires root privileges. In this article, we will explain how to use the lsblk command to list the block devices of a Linux system to

The Linux kernel contains four types of IO schedulers, namely NoopIOscheduler, AnticipatoryIOscheduler, DeadlineIOscheduler and CFQIOscheduler. Typically, disk read and write latency is caused by the head moving to the cylinder. In order to solve this delay, the kernel mainly adopts two strategies: caching and IO scheduling algorithms. Scheduling Algorithm Concepts When a block of data is written to or read from a device, the request is placed in a queue waiting for completion. Each block device has its own queue. The I/O scheduler is responsible for maintaining the order of these queues to utilize the media more efficiently. The I/O scheduler will unordered I/O

Linux is an open source, portable, and customizable operating system that is widely used in various fields, such as servers, desktops, embedded devices, etc. The core of Linux is the kernel, which is responsible for managing hardware resources and providing basic services. However, the kernel is not an independent entity and requires a file system to store and access various data and programs. A file system is a method of organizing and managing files. It defines the file's name, location, attributes, permissions and other information. In Linux, there are many different types of file systems, such as ext4, xfs, btrfs, etc., each of which has its own characteristics and advantages. However, among all file systems, there is a special file system, which is the foundation and core of the Linux system, which is

Question: I want to use df command on Linux to check disk usage space. Can you give me some specific examples of the df command so I can make better use of it? On Linux, if you want to know how much space a specific file system takes up, or how much space is available for a specific file system, you can use the df command. The df command is a command that displays the available disk space of the file system for each filename parameter. If you do not specify any file names, the output will show the available space for all currently mounted file systems. By default, df displays disk space in 1K blocks. Linux has many command line or graphical interface tools that can tell you detailed information about current disk space usage, such as

Linux environment variable configuration When customizing software installation, it is often necessary to configure environment variables. Listed below are various methods of configuring environment variables. The environment description of all the examples below is as follows: System: Ubuntu14.0 User name: uusama Need to configure MySQL environment variables Path: /home/uusama/mysql/binLinux Reading environment variables Method of reading environment variables: The export command displays the current system definition All environment variables echo$PATH command outputs the value of the current PATH environment variable. The effect of executing these two commands is as follows uusama@ubuntu:~exportdeclare-xHOME="/home/uu

When observing the running status of online services on an online server, most people like to use the top command first to see the overall CPU utilization of the current system. For example, for a random machine, the utilization information displayed by the top command is as follows: This output result is simple to say, but complex, it is not so easy to understand it all. For example: Question 1: How is the utilization information output by top calculated? Is it accurate? Question 2: The ni column is nice. It outputs the CPU overhead when processing? Question 3: wa represents iowait, so is the CPU busy or idle during this period? Today we will conduct an in-depth study of CPU utilization statistics. Through today's study, you will not only understand c

This is a common problem plaguing Linux users. This is also a question often asked in exams and interviews. Here's everything you need to know. You may have seen and heard arguments like this online. "Linux is just a kernel" This makes you confused. Is it the kernel? Is it an operating system? What's the difference between the two? I will answer these questions for you in this article. Is Linux an operating system or a kernel? Well, technically speaking, Linux is just a kernel, not an operating system. However, the term Linux usually refers to a complete operating system that includes a shell (such as bash) and command line and/or GUI tools to control the system. The technically correct term for this complete operating system is L

Linux has many command line tools that can perform a wide variety of tasks. However, over time, some tools become obsolete and are replaced by other newer command line tools. In this guide, we’ll focus on 6 deprecated Linux commands and the replacement tools you should use. Most of these commands are network tools provided by the net-tools package, which has not been actively maintained for a long time now. 1.ifconfig command The Linuxifconfig command is a network command used to view and modify the settings of a network interface. It displays network interface details such as interface name, IP address settings, MTU and hardware address, etc. It can also be used