How to check for free disk space and disk usage in Linux?
TocheckfreespaceandlargefilesonLinux,usedfandducommands.Rundf-htoviewfreediskspaceinhuman-readableformat,focusingonthe"Avail"column.Forspecificdirectories,addthepathtothecommand.Usedu-sh/path/to/directorytoseediskusagesummaries,anddu-sh*/|s
Jul 06, 2025 am 01:40 AM
How to find the size of a directory in Linux?
In Linux systems, the most common way to view directory size is to use the du command. 1. Use du-sh/path/to/directory to view the total size of the specified directory, where -s represents summary and -h represents display in a human-readable manner; 2. Use du-h/path/to/directory to list the size of each subdirectory and file in the directory; 3. Use du-h-d1/path/to/directory to limit the display level, such as only displaying first-level subdirectories; 4. Use du-h/path/to/directory to sort by size, and combine head-n20 to display the first 20 results for easy finding.
Jul 06, 2025 am 01:26 AM
What is the difference between an Ansible module and a role?
Ansible modules are tools for performing specific tasks, such as copying files or managing services; roles are reusable units for organizing tasks, templates, and variables. 1. The module is used to complete specific operations and can be called directly in the playbook task, such as copy and service modules; 2. The role packages multiple tasks and related resources to achieve structured reuse, which is suitable for complex automation scenarios; 3. The use of simple one-time tasks is more efficient, and the logic that needs to be shared or reused should be encapsulated as a role. The two often work together, modules are responsible for execution, and roles are responsible for organization.
Jul 06, 2025 am 01:20 AM
How to search for a text string within multiple files on the command line?
YoucansearchforatextstringacrossmultiplefilesfromthecommandlineusinggreponUnix-likesystemsorfindstronWindows.1.Usegrep-r"search_string"/path/to/directoryforrecursivesearches,optionallyadding-n,-i,or-lforlinenumbers,caseinsensitivity,orfilen
Jul 06, 2025 am 01:10 AM
Is Linux faster than Windows?
Linuxisn'tuniversallyfasterthanWindowsbutcanofferbetterperformanceinspecificscenarios.1.LightweightLinuxdistributionslikeLubuntuorXubuntuusefewerresources,makingthemsmootheronolderhardwarecomparedtoWindows,whichtypicallyrunsmorebackgroundservices.2.F
Jul 06, 2025 am 12:45 AM
How to edit a file in the Linux terminal
There are three common ways to edit files in a Linux terminal: 1. Use nano, enter nanofilename.txt to open or create a new file, save ^O, exit ^X; 2. Use vim, enter vimfilename.txt to enter normal mode and press i to enter insert mode. After editing, press Esc to enter:wq to save and exit or:q! without saving; 3. Use cat to cooperate with redirection, cat>filename.txt to overwrite the write content, cat>>filename.txt append the write content. These tools are suitable for scenes where quick editing, full feature editing, and temporary text additions are respectively.
Jul 06, 2025 am 12:36 AM
How to check all open ports and listening services on a system?
Checking the system's open port and listening services are mainly implemented through command line tools. 1. Use netstat-tulnp to view all listening state TCP/UDP ports and corresponding processes; 2. It is recommended to use more modern ss-tulnp commands, which have stronger functions and clearer output; 3. Use lsof-i: to check the services corresponding to specific ports, and reverse check the services can be lsof-i-n|grep; 4. Under Windows, you can check the port through netstat-ano|findstr: and combine it with task manager or tasklist to check the service name according to PID. Mastering these commands can complete the port and service inspection work.
Jul 06, 2025 am 12:19 AM
How would you debug a server that is slow or has high memory usage?
If you find that the server is running slowly or the memory usage is too high, you should check the cause before operating. First, you need to check the system resource usage, use top, htop, free-h, iostat, ss-antp and other commands to check CPU, memory, disk I/O and network connections; secondly, analyze specific process problems, and track the behavior of high-occupancy processes through tools such as ps, jstack, strace; then check logs and monitoring data, view OOM records, exception requests, slow queries and other clues; finally, targeted processing is carried out based on common reasons such as memory leaks, connection pool exhaustion, cache failure storms, and timing task conflicts, optimize code logic, set up a timeout retry mechanism, add current limit fuses, and regularly pressure measurement and evaluation resources.
Jul 06, 2025 am 12:02 AM
How to Disable or Enable SSH Root Login and Limit SSH Access
Everyone knows that Linux systems come with root user access and by default, root access is enabled for the outside world.For security reasons, it’s not a good idea to have ssh root access enabled for unauthorized users. Because any hacker can try to
Jul 05, 2025 am 09:34 AM
How to Setup MySQL Replication in RHEL, Rocky and AlmaLinux
Data replication is the process of copying your data across multiple servers to improve data availability and enhance the reliability and performance of an application. In MySQL replication, data is copied from a database from the master server to ot
Jul 05, 2025 am 09:27 AM
How to Burn CD/DVD in Linux Using Brasero
Frankly speaking, I cannot recall the last time I used a PC with a CD/DVD drive. This is thanks to the ever-evolving tech industry which has seen optical disks replaced by USB drives and other smaller and compact storage media that offer more storage
Jul 05, 2025 am 09:26 AM
Install LXC (Linux Containers) in RHEL, Rocky & AlmaLinux
LXD is described as the next-generation container and virtual machine manager that offers an immersive for Linux systems running inside containers or as virtual machines. It provides images for an inordinate number of Linux distributions with support
Jul 05, 2025 am 09:25 AM
How to Install PowerShell on Fedora Linux
PowerShell is both a command-line shell and fully-developed scripting language built on the .NET framework. Like Bash, it's designed to perform and automate system administration tasks.Previously, PowerShell was exclusive to Windows. That changed in
Jul 05, 2025 am 09:24 AM
How to Install, Create and Manage LXC in Ubuntu/Debian
Over the last decade, the open-source community has seen a steady shift to containerization as the preferred way of deploying applications thanks to the numerous benefits it offers such as portability, flexibility, increased security, and easier mana
Jul 05, 2025 am 09:23 AM
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