The Fourth Edition of Unix was released by Bell Laboratories in November 1973. This was the first version of Unix to be released outside of AT&T and followed a presentation on Unix at the 4th ACM Symposium on Operating System Principles (SOSP) in Yorktown Heights, New York in October 1973. This version of Unix was also the first written in the C language.
The files here come from a tape found at the University of Utah, dated June 1974, and subsequently read by the Computer History Museum. A tarball of the tape's contents can be found here on Angelo Papenhoff's website. The original data extracted by the CHM can be found here and was uploaded by Thalia Archibald.
The man pages in usr/man come from a separate tarball provided by Dennis Ritchie.
| File | Size | Date |
|---|---|---|
| etc | dir | |
| usr | dir |