(taken from Wikipedia)

4.1BSD was a response to criticisms of BSD's performance relative to the dominant VAX operating system, VMS. The 4.1BSD kernel was systematically tuned up by Bill Joy until it could perform as well as VMS on several benchmarks. (The release would have been called 5BSD, but after objections from AT&T the name was changed; AT&T feared confusion with AT&T's Unix System V.)

After 4.1BSD came three intermediate versions: 4.1a incorporated a modified version of BBN's preliminary TCP/IP implementation; 4.1b included the new Berkeley Fast File System, implemented by Marshall Kirk McKusick; and 4.1c was an interim release during the last few months of 4.2BSD's development.

The files here come from the CSRG Archives, and were donated by Kirk McKusick.

For more information about 4.1BSD, see Twenty Years of Berkeley Unix by Kirk McKusick.

.cshrc 803 1982-11-14
.login 93 1983-02-09
.profile 121 1982-06-08
.rhosts 30 1983-02-08
LABEL 444 1993-02-27
a dir
bin dir
dev dir
etc dir
usr dir