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The Unix Tree
Welcome to the Unix Tree. Here you can browse the source code and manualsof various old versions of Unix. For every file, you can also find relatedfiles from other versions: this can help show how the different versions ofUnix are related. Most of the Unix versions below come from theUnix Archive.If you want to get a copy of all the files in the Unix Tree, please don'tspider this website as it causes a high load. You can download a bzippedtarball of the fileshere.
Research Unix
These are the versions of Unix developed at Bell Laboratories, initially by Ken Thompson and Dennis Ritchie, later by many other of the researchers there.USG/USL
Originally set up to support Unix internally, the Unix Support Group eventually became Unix System Laboratories, and developed the System III and System V commercial versions of Unix.Other Early Unixes
As Unix was distributed non-commercially in the mid-1970s, many other institutions took the system and modified it. Many of the changes from these early variants were fed back into the research version of Unix.Early BSDs
The early BSDs, 1BSD and 2BSD, were collections of commands and libraries like the Pascal system, the ex editor and the C-shell. Later systems such as 2.8BSD through to 2.11BSD were complete, installable, 16-bit systems with kernel source.Early Networking
Apart from UCB, there were several organisations which took Unix and modified it to add networking features. Here are just a few of these modifications. Also look at the version of 4.1BSD with BBN's TCP/IP Code.32-bit BSDs
3BSD was the first Unix to provide paged virtual memory. The 4BSDs went on to add features such as networking, the fast filesystem, vnodes & NFS, and they culminated in 4.4BSD-Lite which had been rewritten to contain no original Unix code.Commercial Unixes
Many companies produced modified version of Unix, taking some or all of 32V, System III, System V, 4BSD, merging them and then value-adding to them.Unix Derivatives
Several systems started with Unix source code, but this was written out over time so that no original Unix code remains. The best known examples are OpenSolaris, FreeBSD, NetBSD and OpenBSD.Unix Clones
There have been many systems which implement the Unix system calls, library APIs and commands, but which did not include any original Unix source code. Here is a small selection.
Similarities between files are found using thectcomparetool running in default mode. For each file, the list of similar files isgiven in descending order of the total number of similar token runs.The Unix Tree website is (c) 2010, Warren Toomey.
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