1PREFACE(0)                                                          PREFACE(0)
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5       Although  this Seventh Edition no longer bears their byline, Ken Thomp‐
6       son and Dennis Ritchie remain the fathers and preceptors  of  the  UNIX
7       time-sharing  system.   Many  of  the  improvements here described bear
8       their mark.  Among many, many other people who have contributed to  the
9       further  flowering  of UNIX, we wish especially to acknowledge the con‐
10       tributions of A. V. Aho, S. R. Bourne, L. L. Cherry, G. L. Chesson,  S.
11       I. Feldman, C. B. Haley, R. C. Haight, S. C. Johnson, M. E. Lesk, T. L.
12       Lyon, L. E. McMahon, R. Morris, R. Muha, D. A. Nowitz, L. Wehr, and  P.
13       J.  Weinberger.   We appreciate also the effective advice and criticism
14       of T. A. Dolotta, A. G. Fraser, J. F. Maranzano, and J. R. Mashey;  and
15       we remember the important work of the late Joseph F. Ossanna.
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18                                        B. W. Kernighan
19                                        M. D. McIlroy
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