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Guide to the 'who' Command: Check Current Logged-in Users
`who` command is used to display information about users currently logged into the system on Linux and Unix-like operating systems. It allows you to quickly check which users are logged in, through which terminals, and since when, making it a fundamental tool for system administration and monitoring. Learn how to use the `who` command and its main options through this guide.
whoami: Display the Current Logged-in Username
The `whoami` command prints the effective username of the current logged-in user. It is useful for quickly verifying which user is executing commands.
whois: Domain and IP Information Lookup
whois is a command used to query registration information for internet domain names or IP addresses. It allows you to check various details such as domain owner, registrar, registration date, expiration date, and nameservers.
write: Send a message to another user
The write command is a utility that allows you to send a direct message to another user currently logged into the system. The text you input is displayed in real-time on the recipient's terminal, making it useful for simple one-on-one communication.
xargs: Pass input data as command arguments
`xargs` is a powerful utility that converts standard input into arguments for another command. It is particularly useful when piping the output of commands like `find` or `grep` to another command. The `-n` option specifies the maximum number of arguments to pass to a command at once, preventing too many arguments from being passed simultaneously and allowing for efficient control of command execution.
xxd: Dump binary data in binary format
`xxd` is a utility that dumps the content of files or standard input in hexadecimal or binary format. In particular, the `-b` option allows for detailed analysis of data as binary bit sequences, making it useful for understanding the internal structure of files or for debugging.
xz: Compress/Decompress .xz and .lzma Files
The xz command is used to compress or decompress files using the LZMA2 compression algorithm. It offers higher compression ratios than gzip or bzip2, but may take longer to compress and decompress. It is particularly useful for compressing large files or archives (like tar files).
yes: Repeat strings indefinitely
The `yes` command repeatedly outputs a specified string (defaulting to 'y') on a new line. It is primarily used in scripts to automatically provide a 'y' or other response to user confirmation prompts. It continues to run until interrupted by pressing Ctrl+C.
yum: RPM Package Management
yum (Yellowdog Updater, Modified) is a command-line package management utility used on RPM-based Linux systems for software package installation, updates, removal, and dependency resolution. It automates these tasks, making it easier for users to manage software. It was widely used in CentOS, RHEL, and older versions of Fedora.
zip Command Guide: Compressing Files and Directories
`zip` command is used to compress files and directories in `.zip` format on Linux and Unix-like operating systems. The `.zip` format is widely supported across various operating systems, including Windows, making it very convenient for file exchange and distribution. Through this guide, learn how to install the `zip` command, basic usage, and various compression options.
zipinfo: View ZIP Archive Information
This command displays detailed information about the contents of a ZIP archive, including file list, compression ratio, size, date, and permissions. It's useful for previewing the contents of an archive without actually extracting it.
zsh: The Z Shell
zsh is a powerful and highly customizable Unix shell. It incorporates many features from Bash, ksh, and tcsh, and offers significant improvements such as advanced autocompletion, themes, and a plugin system, making it popular among developers and power users.