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systemd-umount: systemd Unmount
systemd-umount is a command within the systemd system and service manager used for managing and unmounting file system mount points. It is similar to the general `umount` command but integrates with systemd's concept of mount units. It is often called indirectly through the `systemctl` command or used directly when performing specific systemd-related mount operations.
time: Measure Command Execution Time and Resource Usage
The time command measures the time taken for a given command to execute and outputs a summary report of system resources used (CPU time, memory, etc.). It is useful for performance analysis and optimization of programs.
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.
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 -i: Check Hardware Platform Information
The `uname -i` command prints the hardware platform or architecture name of the current system. This is useful for identifying the type of hardware the system is running on, especially when scripts need to perform different actions based on a specific architecture.
uname -m: Check System Architecture
The `uname -m` command outputs the hardware architecture of the current system (e.g., x86_64, aarch64). This is useful for determining if the system is 32-bit or 64-bit, or if it's ARM-based, and is essential for verifying software compatibility.
unmount: Unmounting a File System
Unmount refers to the concept of detaching a mounted file system from the system, and the actual command is `umount`. This command is an essential step before removing USB drives, network shares, secondary disk partitions, etc., from the system. File systems in use cannot be unmounted by default, so all processes accessing the file system must be terminated first.
updatedb: Update locate database
The `updatedb` command creates or updates the index database of the file system, allowing the `locate` command to find files quickly. This database is typically stored at `/var/lib/mlocate/mlocate.db` and contains information about file paths across the entire system. `updatedb` is usually run periodically by system administrators or set up to run automatically via `cron` jobs.
useradd Command Guide: Create New User Accounts
`useradd` command is used to create new user accounts on a Linux system. This command goes beyond simply adding a username; it allows you to set various attributes of the account, such as the user's home directory, shell, group membership, and more. It is essential for system administrators when registering new users or creating service accounts. Use this guide to learn the basics of `useradd` and its various options.
userdel Command Guide: Delete User Accounts
`userdel` command is used to delete existing user accounts on a Linux system. This command is important for cleaning up system resources and maintaining security by removing user account information and optionally their home directories and mail spools. It is essential when system administrators need to remove accounts that are no longer necessary. Use this guide to learn the basics of using `userdel` and its various options.
usermod Command Guide: Modify User Account Properties
`usermod` command is used to modify the properties of an already created user account in a Linux system. It allows system administrators to easily modify various account information such as the user's home directory, shell, group membership, expiration date, etc., making it an essential tool for maintaining existing accounts. Through this guide, learn the basic usage of `usermod` and its various options.
vcgencmd: Querying Raspberry Pi System Information
`vcgencmd` is a command-line tool used to interact with the GPU firmware of the Raspberry Pi to check various system information. This command allows you to easily query CPU temperature, voltage, clock frequency, memory split, and more.