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rmdir Command Guide: Deleting Empty Directories
`rmdir` command (remove directory) is used in Linux and Unix-like operating systems to delete **only empty directories**. If there are files or other subdirectories within the directory, `rmdir` will produce an error and will not delete it. Through this guide, you will understand the basic usage of `rmdir`, its limitations, and when to use this command.
rmmod: Remove a Kernel Module
rmmod is a command used to remove a currently loaded module from the Linux kernel. This command automatically checks module dependencies, ensuring that modules depended upon by other modules are not removed. It is useful for efficiently managing system resources or resolving specific hardware driver issues.
route: IP Routing Table Management
The route command is used to view and manipulate the IP routing table in the Linux kernel. It defines the paths that network packets should follow to reach their destinations and provides functionalities such as adding/deleting static routes and setting the default gateway.
rpm: RPM Package Management
RPM (Red Hat Package Manager) is a powerful command-line tool used in Red Hat-based Linux distributions (RHEL, CentOS, Fedora, etc.) for installing, updating, removing, and querying software packages. It is designed for efficient management of packages in the `.rpm` format.
rsync: Synchronizing Files and Directories
rsync is a powerful utility for efficiently synchronizing files and directories between local or remote systems. It uses a delta-transfer algorithm that transfers only the changed parts, saving network bandwidth and optimizing transfer speeds. It is used for various purposes such as backups, mirroring, and file distribution.
sar: System Activity Reporter
The sar (System Activity Reporter) command is used to collect and report various system activity information in real-time, including CPU, memory, disk I/O, and network. It is an essential tool for system performance analysis and troubleshooting.
Mastering the scp Command
This guide covers the `scp` command, which uses the Secure Copy Protocol (SCP) to securely copy files between local and remote hosts on Linux. This tool allows you to easily and securely transfer files over the network.
screen: Managing Multiple Terminal Sessions
GNU Screen is a terminal multiplexer that allows you to manage multiple independent shell sessions within a single terminal. It offers powerful features such as maintaining sessions even if network connections drop, performing multiple tasks concurrently, and sharing sessions with other users. It is particularly useful for keeping long-running tasks running safely in the background on servers.
screenfetch: Display System Information with ASCII Art
screenfetch is a script that visually displays system information such as operating system, kernel, CPU, GPU, and memory in an attractive ASCII art format, along with the distribution logo. It is useful for quickly checking system status or for sharing in screenshots.
script: Record Terminal Sessions
The script command records your terminal session and saves it to a 'typescript' file. This file includes all commands you type and everything that is outputted to the terminal. Recorded sessions can be useful for later review, reproduction, or sharing with others.
scriptreplay: Replaying Terminal Sessions
scriptreplay is a tool that replays terminal sessions (typescript) recorded by the 'script' command, along with timing information. It recreates everything a user typed and outputted in the terminal at the recorded time intervals, making it useful for various purposes such as education, demonstrations, troubleshooting, and security audits. It is particularly effective for reproducing complex command sequences or specific scenarios.
sdiff: Compare Two Files Side-by-Side
The sdiff command compares two files in parallel, outputting their differences side-by-side in two columns for easy visual inspection. Unlike the `diff` command, it clearly distinguishes common and differing parts visually.