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tmux: Terminal Multiplexer
tmux is a terminal multiplexer that allows you to manage terminal sessions and use multiple terminal windows on a single screen. It is particularly useful for remote work as sessions persist even if the SSH connection is lost, and it helps you perform multiple tasks concurrently within a single terminal.
Guide to the top Command: Real-time System Process Monitoring
`top` command (table of processes) is a tool used to monitor system process activity in real-time on Linux and Unix-like operating systems. It provides a dynamic overview of the current state of the system, including CPU usage, memory usage, and a list of running processes, making it essential for diagnosing performance issues and understanding resource usage. Through this guide, learn the basic usage and interaction features of the `top` command.
Guide to the touch Command: Creating Files and Changing Timestamps
`touch` command is used in Linux and Unix-like operating systems to update the access time (atime) and modification time (mtime) of a file or to create a new file if it does not exist. It is useful for creating temporary files in shell scripts or setting the modification time of a file to a specific point in time. Learn the basics of using the `touch` command and its various options through this guide.
tr: Character Translation and Deletion Filter
The `tr` command is a filter command used to translate or delete characters from text received via standard input (stdin). It is particularly useful when used with pipes (|) to process the output of other commands.
traceroute: Trace Network Path
The traceroute command traces the route packets take to a network host and measures the transit delays of the packets through the Internet protocol. It is useful for diagnosing network problems and analyzing paths.
Guide to the tree Command: Output Directory Structure in Tree Format
`tree` command is used in Linux and Unix-like operating systems to visually display the contents of a specified directory in a hierarchical tree format. It allows you to quickly grasp files and subdirectories, making it very useful for navigating and documenting complex project structures or file systems. In this guide, learn how to install the `tree` command, its basic usage, and various options.
Mastering the ufw Command
`ufw` (Uncomplicated Firewall) is a command that makes it easy to manage firewalls in Ubuntu/Debian environments. It is important to fully understand its basic operation principles and options as it is the first step in server security.
umask Command Guide: Setting Default Permissions for Newly Created Files/Directories
`umask` command (user file-creation mode mask) is used in Linux and Unix-like operating systems to control the default access permissions for newly created files and directories. It plays an important role in enhancing security by setting a permission restriction mask that is automatically applied when files are created, preventing files from being created with unnecessarily broad permissions. Through this guide, you will learn the concept and usage of `umask`.
umount: Unmounting File Systems
The `umount` command safely detaches file systems that were mounted using the `mount` command. It is an essential command that must be executed before physically removing storage devices such as USB drives or external hard drives.
uname: Display System Information
This command displays various information about the operating system and the system. You can check key system information such as kernel name, host name, kernel version, and hardware architecture.
uniq Command Guide: Remove and Identify Duplicate Lines
The `uniq` command is used to remove consecutively duplicated lines from text files or data passed via pipes, or to count the number of duplicated lines. Its true value is realized when used with the `sort` command, making it an essential tool for data cleaning and analysis.
unset: Remove Variables and Functions
The unset command is used to remove variables or functions defined in the shell environment. It allows you to free up memory for environment variables or user-defined functions that are no longer needed.