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export: Setting Environment Variables
The `export` command makes shell variables available to child processes, effectively turning them into environment variables. This is useful when scripts or programs need to access specific values.
expr: Evaluate Expressions
The expr command evaluates various expressions, including integer arithmetic, string manipulation, and logical operations, and returns the result to standard output. It is useful in shell scripting for calculating variable values or implementing conditional logic.
Complete Guide to Fail2Ban
Fail2Ban is a security tool that automatically blocks brute-force attacks on servers. This guide covers everything from installing Fail2Ban to configuring it and its key commands.
fdisk: Disk Partition Management Tool
fdisk is a command-line based disk partition management tool used in Linux systems to create, modify, and delete hard disk partition tables. It is primarily used for managing MBR (Master Boot Record) partition tables, allowing for efficient management of disk structure.
fg: Bring Background Jobs to Foreground
The `fg` command is used to bring a job running in the background or suspended to the foreground, reactivating it. It is useful when you need to see the job's output in the terminal or regain user input.
file: Guide to Identifying File Types
Determines the type and MIME information of files by examining their actual byte content instead of relying on extensions. It uses the libmagic database.
Mastering the find Command
This is a guide to the `find` command, which is used to search for files and directories within the file system in Linux. You can efficiently find the files you want by combining various conditions and actions.
fold: Text Wrapping and Line Limiting
The fold command is used to wrap each line of input text to a specified width. It is useful for making long text files more readable or for processing text in environments with specific width limitations.
free Command Guide: Check System Memory Usage
The `free` command is used on Linux systems to display the total amount of available physical memory (RAM) and swap memory, along with their usage and free space. It is an essential tool for system performance monitoring and troubleshooting. Through this guide, learn how to easily check memory information using various options of the `free` command.
fsck: File System Consistency Check and Repair
The `fsck` command is used to check the consistency of a file system and repair damaged parts. It can also run automatically to prevent file system corruption when a system shuts down abnormally. It is primarily used for troubleshooting boot issues or checking for disk errors.
ftp: File Transfer Protocol Client
The ftp command is a command-line client used to connect to an FTP (File Transfer Protocol) server to upload or download files. Although an older protocol, it is still used in some environments and is useful for simple file transfer tasks.
Git Command Guide: The Core of Version Control Systems
Git is a distributed version control system (DVCS) used in software development to track changes in source code and facilitate collaboration among multiple developers. It is essential for efficient code management and stable collaboration. Through this guide, you will learn the basic concepts of Git and its main commands to effectively manage your projects.