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How to Use the gpasswd Command on Linux
(www.howtogeek.com)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
Kind of, most of it is actually open source, so there's a fully open source self hosted alternative called Vaultwarden.
But that has nothing to do with gpasswd.
Even the server part for Bitwarden is open source and you can self-host it. Yes, Vaultwarden is a community alternative which is known to be lighter, but you have the choice from Bitwarden too.