\amethyst 1208464867 learn Seventh Edition Unix (V7), released in 1979, is the common ancestor of both BSD and System V, and marked the appearance of the Bourne Shell, which replaced the earlier Thompson Shell. If your script needs to work on pre-POSIX Unix systems, the features of v7 are a good least common denominator of nearly all Unix systems. A full tree of V7, including source and manpages, may be found at http://minnie.tuhs.org/UnixTree/V7/usr/ . \amethyst 1208464884 forget \amethyst 1208464959 learn Seventh Edition Unix (V7), released in 1979, is the common ancestor of both BSD and System V. The Bourne Shell first appeared in V7, replacing the earlier Thompson Shell. If your script needs to work on pre-POSIX Unix systems, the features of V7 are a good portability target, as they represent the least common denominator of nearly all extant Unices. A full tree of V7, including source and manpages, may be found at http://min \amethyst 1208465533 forget \amethyst 1208465676 learn Seventh Edition Unix (V7, 1979), introduced the Bourne shell, which replaced the earlier Thompson shell. If your script needs to work on pre-POSIX Unix systems, V7 is a good portability target. A full tree of V7, including source and man pages, may be found at http://minnie.tuhs.org/UnixTree/V7/ .