Disk Usage & System Info (df, du, uname)

Understanding your system's disk usage and core information is crucial for maintaining a healthy and efficient Linux environment.

• Resource Management: Know when disk space is running low.
• Troubleshooting: Identify oversized files or directories.
• System Awareness: Get details about your operating system kernel and architecture.

The df command, short for 'disk free', displays the amount of available disk space for filesystems mounted on your system.

It shows:

• Filesystem name
• Total size
• Used space
• Available space
• Usage percentage
• Mount point

By default, df shows sizes in 1-kilobyte blocks, which can be hard to read. The -h option makes the output much friendlier.

It converts sizes to human-readable units like KB, MB, or GB, making it easy to quickly grasp disk usage.

Try running df -h to see the free disk space on your system in an easy-to-understand format.

While df tells you about *free* space on filesystems, du (disk usage) tells you about the space *used* by specific files or directories.

It's great for finding out which files or folders are consuming the most space within a directory.

To get a quick summary of a directory's total size, you often combine two options with du:

• -s: Displays only a total for each argument.
• -h: Shows sizes in human-readable format (e.g., 10M, 2.5G).

Using du -sh . will show the total size of the current directory.

Let's find out the total disk usage of your current working directory using du -sh .

The uname command (short for 'UNIX name') is used to display system information. This includes details about the operating system kernel.

It's useful for quickly checking what version of Linux you're running or the system's architecture.

To get a comprehensive overview of your system's information, use the -a (all) option with uname.

This will typically show the kernel name, network node hostname, kernel release, kernel version, machine hardware name, processor type, hardware platform, and operating system.

Execute uname -a to view all available system information about the machine you are currently on.

Which of these commands are used to check disk or system information?

In this lesson, you learned how to effectively monitor your Linux system's disk usage and retrieve essential system information.

• df: Shows free disk space on mounted filesystems.
• du: Displays disk usage of files and directories.
• uname: Provides core system and kernel information.

These commands are vital for system administration, troubleshooting, and keeping your Linux environment running smoothly!