Linux & BSD All In One
BSD
FreeBSD
The FreeBSD Project
FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms. A large community has continually developed it for more than thirty years. Its advanced networking, security, and storage features have made FreeBSD the platform of choice for many of the busiest web sites and most pervasive embedded networking and storage devices.
BSD 协议 (开源协议)
BSD 2-Clause "Simplified" License
BSD 3-Clause "New" or "Revised" License
None
Apache License 2.0
GNU General Public License v3.0
MIT License
BSD 2-Clause "Simplified" License
BSD 3-Clause "New" or "Revised" License
Boost Software License 1.0
Creative Commons Zero v1.0 Universal
Eclipse Public License 2.0
GNU Affero General Public License v3.0
GNU General Public License v2.0
GNU Lesser General Public License v2.1
Mozilla Public License 2.0
The Unlicense
https://www.runoob.com/note/13176
Unix
https://unix.org/what_is_unix.html
https://unix.org/what_is_unix/history_timeline.html
GNU
https://www.gnu.org/software/bash/manual/bash.pdf