How to view systemd logs with journalctl?
How to view systemd logs? Use the journalctl command. journalctl is a powerful tool for querying and displaying systemd logs, providing structured log data. 1. Run journalctl to view all logs; 2. Add -x parameters to improve readability; 3. Use --since and --until to filter logs by time; 4. Use -u parameters to add service names to view specific service logs; 5. Use -b or --list-boots to view different startup logs; 6. Use -f parameters to monitor logs in real time. Proficiency in these techniques can help quickly troubleshoot system problems.
Jun 20, 2025 am 12:18 AM
How to schedule a recurring task using cron?
To set up periodic tasks using Linux cron, first open the crontab editor and enter the command crontab-e (use sudocrontab-e for system-level tasks); secondly, master the five-segment cron expression, such as 306* means to execute tasks at 6:30 every day; then optionally set environment variables and logging to avoid execution problems, such as defining SHELL, PATH and LOGFILE, and redirecting the output to the log; finally view the task through crontab-l and clear the task through crontab-r. If the task is not executed, you can view the system log to troubleshoot problems.
Jun 20, 2025 am 12:14 AM
How to check if a specific port is open and listening?
To confirm whether a specific port is open and listen, 1. Use sudonetstat-tuln|grep: or sudoss-tuln|grep: on Linux/macOS; 2. Run netstat-an|findstr: on Windows; 3. Check that the remote host can use telnet or nc-zv to test the connection, and if successful, the port will be open. These methods can effectively determine the listening status of local or remote ports.
Jun 20, 2025 am 12:06 AM
How to Install OpenSSH Server from Source in Linux
OpenSSH is a free and open source, full implementation of the SSH protocol 2.0, which provides a number of tools for securely accessing and managing remote computer systems, and managing authentication keys, such as ssh (a secure replacement for teln
Jun 19, 2025 am 10:50 AM
Gogo - Create Shortcuts to Directory Paths in Linux
Gogo is a remarkable tool to bookmark directories inside your Linux shell. It helps you create shortcuts for long and complex paths in Linux. This way, you no longer need to type or memorize lengthy paths on Linux.For example, if there's a directory
Jun 19, 2025 am 10:41 AM
MimiPenguin - Dump (Hack) Login Passwords of Linux Users
MimiPenguin is a free and open source, simple yet powerful Shell/Python script used to extract login credentials (usernames and passwords) from the current Linux desktop user. It has been tested across various Linux distributions.Moreover, it support
Jun 19, 2025 am 10:35 AM
Conky - The Ultimate X-Based System Monitor Tool
Conky is a free, lightweight, simple, and customizable system monitor for X that displays any kind of information on your desktop or within its own window. Since it's cross-platform, it can also be used with Wayland and macOS.Conky provides over 250
Jun 19, 2025 am 10:33 AM
Autojump - A Faster Way to Navigate Directories in Linux
Those Linux users who mainly work with Linux command Line via console/terminal feels the real power of Linux. However, it may sometimes be painful to navigate inside the Linux Hierarchical file system, especially for newbies. There is a Linux command
Jun 19, 2025 am 10:06 AM
How To Install Docker Desktop on Ubuntu and Linux Mint
Docker Desktop is an easy-to-use cross-platform GUI (Graphical User Interface) application used to manage Docker images, containers, and apps from your local computer. It can be used either as a standalone tool or in combination with the command-line
Jun 19, 2025 am 09:32 AM
27 Best IDEs or Source Code Editors for Linux
C is an excellent, powerful, and general-purpose programming language that offers modern and generic programming features for developing large-scale applications ranging from video games, search engines, and other computer software to operating syste
Jun 19, 2025 am 09:24 AM
How to Install and Configure OpenSSH Server In Linux
Being a network administrator requires deep knowledge of remote login protocols such as rlogin, telnet, and ssh. The one I will discuss in this article is ssh.SSH is a secure remote protocol that is used to work remotely on other machines or transfer
Jun 19, 2025 am 09:23 AM
NVM - Install and Manage Multiple Node.js Versions in Linux
Node Version Manager (NVM) is a simple bash script that helps manage multiple Node.js versions on your Linux system. It enables you to install various Node.js versions, view available versions for installation, and check already installed versions.NV
Jun 19, 2025 am 09:09 AM
How to install a local .deb or .rpm file?
To install the local .deb or .rpm file, you need to confirm the system type, dependencies and installation commands. 1. Confirm that the file type matches the system: .deb is suitable for Debian/Ubuntu, .rpm is suitable for RedHat/Fedora/CentOS. The architecture must be consistent. You can use uname-m to view the system architecture. 2. Use the dpkg command for installing the .deb file: sudodpkg-package.deb. Dependency problems are fixed with sudoapt-getinstall-f. The content is viewed with arxpackage.deb. 3. Install the rpm file with rpm command: sudorpm-ivhpackage.rpm, recommended
Jun 19, 2025 am 12:53 AM
How to view all active network connections with netstat or ss?
ToviewactivenetworkconnectionsonLinux,usenetstatorss.1.Netstatisolderanddeprecatedbutstillwidelyused;runsudonetstat-tulnptoshowTCP/UDPconnections,listeningports,IPaddresses,andprocessinfo.2.Ssisfasterandrecommended;usesudoss-tulnpforsimilaroutputwith
Jun 19, 2025 am 12:48 AM
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