How to Use the Command `check-dfsg-status` (with Examples)

The check-dfsg-status command is an essential tool for those using Debian-based operating systems who are concerned about the presence of non-free and contrib software packages. It helps users identify which packages on their systems do not adhere to the Debian Free Software Guidelines (DFSG). The command was formerly known as vrms, named humorously after Richard M. Stallman, a prominent advocate for free software. The command’s main objective is to provide transparency about the non-free components installed on a user’s system, which can be crucial for those prioritizing open-source and free software for ethical or security reasons.

Use Case 1: List Non-Free and Contrib Packages (and Their Descriptions)

Code:

check-dfsg-status

Motivation:

The motivation behind using the command without any additional options is to get a comprehensive understanding of all non-free and contrib packages installed on a Debian-based system. By running it, users receive a complete list of these packages along with their descriptions, allowing them to review the nature and purpose of each package. This can be particularly beneficial for system administrators, security analysts, or any individual who wants to ensure that their system complies with free software principles.

Explanation:

• check-dfsg-status: This is the primary command used to report non-free and contrib software packages. Without any additional arguments or options specified, the command defaults to providing a detailed list of packages including their descriptions, offering insights into the software’s functionality and origins.

Example Output:

Non-free packages installed on your system:
firmware-linux-nonfree - Binary firmware for various drivers in the Linux kernel
skypeforlinux - Skype for Linux
google-chrome-stable - The stable version of the Google Chrome web browser
3 non-free packages, 0.2% of the total installed.

Contrib packages installed on your system:
flashplugin-nonfree - Adobe Flash Player - browser plugin
1 contrib packages, 0.1% of the total installed.

Use Case 2: Only Output the Package Names

Code:

check-dfsg-status --sparse

Motivation:

There are scenarios where users need a concise view of non-free and contrib packages without the clutter of additional descriptions. This is especially useful when scripting or when the package names themselves are sufficient for administrative or compliance purposes. Using the --sparse option simplifies the output, presenting just the package names, thus allowing for easier parsing or further automated processing.

Explanation:

• check-dfsg-status: This remains the core command responsible for checking the DFSG status of installed packages.
• --sparse: This option modifies the output format to be more succinct, displaying only the package names. The purpose of this argument is to enhance efficiency by reducing the output to just the essentials, which can save time and resources when handling large datasets or during automated tasks.

Example Output:

firmware-linux-nonfree
skypeforlinux
google-chrome-stable
flashplugin-nonfree

Conclusion

The check-dfsg-status command is a powerful utility for users of Debian-based systems who prioritize the use of free and open-source software. By offering options to view detailed descriptions or just package names, it provides flexibility depending on the user’s needs. Whether for personal interest, security audits, or ensuring compliance with free software policies, this command is an invaluable tool to help users maintain transparency and control over the software installed on their systems.