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diff: Guide to Comparing Files/Directories
Compares differences between two targets line by line and outputs them in a human-readable format (unified/context/side-by-side). It is widely used for creating patches, code reviews, and comparing configuration changes.
dig: DNS Information Lookup Tool
dig (Domain Information Groper) is a command-line tool used to query Domain Name System (DNS) related information. It queries various DNS records, such as the IP address and MX records of a specific domain, and displays detailed response results. It is an essential tool for DNS troubleshooting and network management.
Guide to the dirname Command
The `dirname` command is used to extract the directory path without the file name from a given file path. It is particularly useful in shell scripts when referencing other files or directories based on the location of a file.
dmesg: Check Kernel Messages
The dmesg command outputs the contents of the kernel's message buffer. It is useful for checking kernel-related logs such as system boot processes, hardware detection, and driver errors, and is an essential tool for system problem diagnosis and debugging.
dmidecode Command Guide
`dmidecode` is a tool that outputs information from the DMI (Desktop Management Interface) table in a human-readable format. It is useful for checking hardware specifications of the system, particularly information about the motherboard, BIOS, and memory.
Docker Command Guide
Docker is a container-based virtualization platform that helps you deploy and run applications quickly and reliably. Learn the key Docker commands with this guide.
Docker Compose Command Guide
Docker Compose is a tool for defining and running multi-container Docker applications. Using a YAML file, you can configure the services of your application and start all services with a single command. This makes it easy to manage complex application environments.
Docker ps Command Guide
The `docker ps` command is used to view a list of currently running Docker containers. Through this guide, learn how to effectively filter and check desired container information by utilizing various options of `docker ps`.
Docker Volume Command Guide
Docker volumes are the recommended mechanism for persistently storing data generated and used by Docker containers. Even if a container is deleted, the data stored in the volume is preserved, allowing you to manage containers without data loss. This guide covers how to create, manage, and delete Docker volumes.
Mastering the du Command
A guide to the `du` command, which reports disk usage of files and directories in Linux. This tool helps you easily check and manage disk space for specific paths.
echo Command Guide: Printing Text and Variables
The `echo` command is used to display a string of text to the standard output (usually the terminal screen). It is widely used in shell scripts to show messages to the user, check variable values, append content to files, and more. This guide will help you learn the basic usage and useful options of the `echo` command.
env Command Guide: Viewing and Setting Environment Variables
The `env` command is used to print a list of environment variables for the current shell or to run another command with specific environment variables set. It's useful for controlling the environment in shell scripts or temporarily changing the environment when running a program. Learn various ways to use the `env` command with this guide.