 | | Between 1971 and 1979, a number of UNIX variants were created inside Bell Laboratories. The main version, developed by Thompson and his coworkers, evolved through Version 4 (the first version written in C), Version 6 (the first version to be licensed outside Bell Labs), and finally Version 7. Most people would not recognize any of these versions, except perhaps Version 7, as looking much like the UNIX of today. During this same time, a number of other lesser-known versions were developed by various groups inside Bell Labs, including PWB/UNIX, MERT, RT, and CB UNIX. UNIX by this time had been ported to several varieties of PDP-11, the Interdata 8/32, the IBM VM/370 environment, and even the IBM Series 1. Shortly after its release, Version 7 was ported to the VAX and called UNIX 32V. | |
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