This is version 2.2.1 (2023-09-25) of nex/nvi, a reimplementation of the ex/vitext editors originally distributed as part of the Fourth BerkeleySoftware Distribution (4BSD), by the University of California, Berkeley.The directory layout is as follows:    LICENSE ....... Copyright, use and redistribution information.    README ........ This file.    catalog ....... Message catalogs; see catalog/README.    cl ............ Vi interface to the curses(3) library.    common ........ Code shared by ex and vi.    ex ............ Ex source code.    files ......... Template files.    man ........... Ex/vi documentation.    regex ......... Modified regex library with wide character support.    vi ............ Vi source code.=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=o Nvi was written by Keith Bostic, and the last version is 1.79.  After that,Sven Verdoolaege added the iconv support and the DB3 locking.Jun-ichiro itojun Hagino developed the file encoding detectiontechniques in his nvi-m17n.o In nvi2, Zhihao Yuan incorporated the multibyte encoding support onto DB1.It was not possible without great support from Alexander Leidinger,Peter Wemm, and the FreeBSD community.Last but not least, money from Google Summer of Code.o Since then,Todd C. Miller and Craig Leres adopted and refined the NetBSD-styleexpandtab option.Yamamoto Takashi, Matija Skala, and Jessica Clarke ported thesoftware to macOS and Linux.Anthony J. Bentley made heroic efforts to modernize the code baseand documentation, leveraging experience from OpenBSD to improve thequality of the project....and many others, including Michael McConville, Marc Simpson,Jeffrey H. Johnson, Bosco García, Anton Konyahin, Walter AlejandroIglesias, and those who tried hard to keep anonymous on GitHub :)Their insights render the software usable, secure, and sustainable.The following acknowledgments were written by Keith Bostic:=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=o This software is several years old and is the product of many folks' work.This software was originally derived from software contributed tothe University of California, Berkeley by Steve Kirkendall, theauthor of the vi clone elvis.  Without his work, this work wouldhave been far more difficult.IEEE POSIX 1003.2 style regular expression support is courtesy ofHenry Spencer, for which I am *very* grateful.Elan Amir did the original 4BSD curses work that made it possibleto support a full-screen editor using curses.George Neville-Neil added the Tcl interpreter, and the initialinterpreter design was his.Sven Verdoolaege added the Perl interpreter.Rob Mayoff provided the original Cscope support.o Many, many people suggested enhancements, and provided bug reports and  testing, far too many to individually thank.o From the original vi acknowledgements, by William Joy and Mark Horton:Bruce Englar encouraged the early development of this displayeditor.  Peter Kessler helped bring sanity to version 2'scommand layout.  Bill Joy wrote versions 1 and 2.0 through 2.7,and created the framework that users see in the present editor.Mark Horton added macros and other features and made the editorwork on a large number of terminals and Unix systems.o And...The financial support of UUNET Communications Services is gratefullyacknowledged.