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quota: Check Disk Usage Quotas
The quota command reports disk usage and quota limits for users or groups on a file system. It is useful for users to check the disk usage limits set by system administrators.
read: Reading User Input
The read command reads a single line from standard input (stdin) or a specified file descriptor and stores it in one or more variables. It is commonly used in shell scripting to get user input or process file content. This command is built into most shells, including Bash and Zsh.
readelf: Display Information About ELF Files
The readelf command is used to analyze and display detailed information about executable files, shared libraries, object files, and other files in the ELF (Executable and Linkable Format). This information includes headers, sections, symbol tables, and dynamic linking information.
readlink Command Guide
`readlink` command is used to output the actual target path of a symbolic link. A symbolic link acts as a pointer to a file or directory, similar to a 'shortcut' in Windows. `readlink` is particularly useful when you need to accurately determine the original path of a symbolic link while scripting.
realpath: Get Real Path
The realpath command resolves symbolic links and removes redundant path components like '.' or '..' to output the absolute path of a file or directory. This is useful for accurately determining file locations in scripts or simplifying complex paths.
Guide to the reboot Command: Restarting the System
`reboot` command is used to safely restart a Linux system. It is utilized when applying system updates, troubleshooting issues, or needing to reset the system state. This guide explains the basic usage of `reboot` and highlights the differences with the recommended `systemctl reboot` method in modern Linux systems.
Redirection Guide: Changing Command Input/Output Direction
Redirection in the Linux shell is a feature that changes the direction of a command's standard input/output. It is used to feed the content of a file as input to a command, or to save the output of a command to a file instead of displaying it on the screen. Along with pipes (`|`), it is one of the most fundamental tools for shell scripting and data processing.
rename: Batch Rename Tool for Multiple Files
The `rename` command is used to change the names of multiple files at once using regular expressions. Unlike `mv`, it is very useful for batch modifying filenames based on patterns.
renice: Change Priority of Running Processes
Changes the Niceness (priority) value of already running processes in real-time. Used to reduce resource consumption of a specific process (yielding) when the system slows down, or to allocate more resources to critical tasks.
restorecon: Restore SELinux Security Contexts
The restorecon command is used to restore the SELinux security contexts of files and directories on the filesystem to their system policy-defined defaults. This is essential for resolving access denial issues that can occur when files have incorrect contexts, particularly useful after moving, copying, or creating files where the context might not have been set correctly.
rev: Reverse a String
The rev command reads lines from standard input or a file, reverses the order of characters in each line, and outputs the result to standard output. It's a simple yet useful utility often used with pipes (|) to manipulate the output of other commands.
Mastering the rm Command
The `rm` command is used to delete files or directories. Using it carelessly can lead to data loss that is difficult to recover, so it's essential to understand the meaning of each option and how to use it safely.