This is a partial history of this shell gleened from old change logs and
readmes (most of which are still in the misc directory) and the source
code.  Hopefully it is correct and no contributors have been left out
(file a bug report if you spot a problem :-)).

Release history:
    * Eric Gisin (egisin@math.uwaterloo.ca), created pdksh, using
      Charles Forsyth's public domain V7 shell as a base; also used parts
      of the BRL shell (written by Doug A Gwyn, Doug Kingston, Ron Natalie,
      Arnold Robbins, Lou Salkind, and others?, circa '87; the parts used in
      pdksh included getopts, test builtin, ulimit, tty setting/getting, emacs
      editing, and job control; the test builtin was based on code by Erik
      Baalbergen).
      '87..'89 ?
      Released versions: .. 3.2
    * John R MacMillan (@yonge.csri.toronto.edu:chance!john@sq.sq.com)
      takes over as maintainer
      dates?
      Released versions: 3.3 (?)
    * Simon J. Gerraty (sjg@zen.void.oz.au) takes over as maintainer
      Nov '91..July '94 ?
      Released versions: 4.0 .. 4.9
    * Michael Rendell (michael@cs.mun.ca) takes over as maintainer
      July, 1994
      Released versions: 5.0 .. 5.1

Major contributions:
    * John R MacMillan (@yonge.csri.toronto.edu:chance!john@sq.sq.com), ?:
      cleaned up configuration, many bug fixes (see misc/Changes.jrm).
    * Simon Gerraty, (sjg@zen.void.oz.au), Nov '91..?: much improved emacs mode
      ala at&t ksh, 386bsd port, sigaction routines for non-POSIX systems
      (see misc/ChangeLog.sjg and misc/ReadME.sjg).
    * Peter Collinson (pc@hillside.co.uk), July '92: added select, at&t ksh
      style history file, original csh-style {} globbing, BSD/386 port,
      misc bug fixes.
    * Larry Bouzane (larry@compusult.nf.ca), Mar '89..'93: re-wrote job control,
      added async job notification, added CDPATH and other cd fixes, misc bug
      fixes.
    * John Rochester (jr@cs.mun.ca), '87: wrote vi command line editor; various
      bug fixes/enhancements.
    * Jeff Sparkes (jsparkes@bnr.ca), Mar '89..Mar '90: added arrays,
      merged John Rochester's vi code into pdksh, misc bug fixes.
    * Michael Harrdt (u31b3hs@POOL.Informatik.RWTH-Aachen.DE), Sept '94:
      organized man page, filled in many of its copious blank spots; added
      KSH ifdefs.
    * Dale DePriest (daled@cadence.com): ported to OS/2 (initially based on
      port of pdksh4.9 to OS/2 by Kai Rommel (rommel@ars.muc.de)); maintains
      OS/2 port.

Other contributors:
    * Piercarlo Grandi (pcg@aber.ac.uk), Dec '93: fixes for linux port
    * Neil Smithline (Neil.Smithline@eng.sun.com), Aug '92: emacs-style
      filename completion.
    * Mike Jetzer [mlj] (jetzer@studsys.mscs.mu.edu), ?;Nov '94: fixes for vi
      mode (see misc/Changes.mlj), added v to vi, fixes for history; fixed
      command redoing in vi; fixes to vi globing.
    * Robert J Gibson: mailbox checking code that was adapted for pdksh by
      John R. MacMillan.
    * ? (guy@demon.co.uk), ?: promptlen() function.
    * J.T. Conklin (jtc@cygnus.com): POSIXized test builtin; miscellaneous
      fixes/enhancements.
    * Sean Hogan (sean@neweast.ca): fixes for ICS 3.0 Unix, found and helped
      fix numerous problems.
    * Gordan Larson (hoh@approve.se): fix to compile sans VI, ksh.1 typo.
    * Thomas Gellekum (thomas@ghpc8.ihf.rwth-aachen.de): fixes for Makefile
      typos, fixed CLK_TCK for FreeBSD, man page fixes.
    * Ed Ferguson (Ed.Ferguson@dseg.ti.com): fix to compile sans VI.
    * Brian Campbell (brianc@qnx.com): fixes to compile under QNX and
      to compile with dmake.
    * (guy@netapp.com), Oct '94: patch to use gmacs flag.
    * Andrew Moore (alm@netcom.com): reported many bugs, fixes.
    * William Bader (wbader@CSEE.Lehigh.Edu): fix to compile on SCO Unix
      (strut winsize).
    * Mike Long (mike.long@analog.com): makefile fix - use $manext, not 1.
    * Art Mills (aem@hpbs9162.bio.hp.com): bug fix for vi file completion in
      command mode.
    * Tory Bollinger (tboll@authstin.ibm.com): allow ~ in vi mode to take
      a count.
    * Frank Edwards (<crash@azhrei.EEC.COM>): added macros to vi (@char).
    * Fritz Heinrichmeyer (<Fritz.Heinrichmeyer@FernUni-Hagen.de>): fixes
      to allow compile under Linux 1.4.3.
    * Gabor Zahemszky (<zgabor@CoDe.hu>): SVR3_PGRP vs SYSV_PGRP, many
      bug reports and man page fixes.
    * Dave Kinchlea (<kinch@julian.uwo.ca>): DEFAULT_ENV patches.