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AUTHORS
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The original Thompson shell was principally written by Ken Thompson
of Bell Labs. However, it should be noted that other individuals
at Bell Labs also had a role in its development: Dennis M. Ritchie,
M. D. McIlroy, J. F. Ossanna, and quite likely others as well.
Jeffrey Allen Neitzel is the principal developer and maintainer of
the enhanced, backward-compatible port of the Sixth Edition (V6)
UNIX Thompson shell (and all other software) released as part of
the osh project.
============
Definitions:
compatibility - backward compatibility
osh - enhanced port of the Sixth Edition (V6) UNIX Thompson shell
sh6 - port of the Sixth Edition (V6) UNIX Thompson shell
(sh6 references implicitly include glob6)
===
Notice that I have released three different implementations of
osh(1) since July 2003. The origin and primary objectives of
each one are described below.
================================
[osh-030730 through osh-060124]:
The first implementation was originally authored by Gunnar
Ritter as osh-020214/osh.c and was then adopted by Jeffrey
Allen Neitzel.
Unfortunately, the design of Gunnar's implementation was
incompatible with the Thompson shell in several respects.
Thus, it required a lot of workarounds in order to fix the
design incompatibilities.
I modified Gunnar's design to separate command-line parsing
and execution so that the shell could at least be compatible
in the most basic sense. The only catch was that word
splitting was still incompatible. Thus, this partial
solution was always destined for eventual replacement.
Primary objective was compatibility.
===
====================================
[osh-20061230 through osh-20100228]:
The second implementation was originally authored by Ken
Thompson as Sixth Edition UNIX /usr/source/s2/sh.c and was
then ported by Jeffrey Allen Neitzel for personal use in
January 2004.
I eventually released it as sh6(1) in osh-060124. Then,
after its release, I realized that the design of the original
shell (see: osh-060124/*6.c) offered a far better starting
point for making osh(1) truly backward-compatible with the
Thompson shell.
Bothered by the fact that osh(1) still had incompatible
word-splitting behavior, I abandoned the design used in the
first implementation, adapted sh6.c and glob6.c, copied
them to osh.c, and began working on it during my free time
in 2006. Finally, I released the new implementation of
osh(1) in osh-20061230.
Primary objective was compatibility.
===
===================================
[osh-20100430 through osh-current]:
The third implementation continues with primary objectives
of compatibility and long-term stability. Consequently,
all new features (if/when added) must work in concert
with primary objectives. Otherwise, they will not
be added.
===
I wish to thank the original authors very much for their efforts.
Without their previous work, none of this software or documentation
would exist today.
See the DEDICATIONS file for further info.
Jeffrey Allen Neitzel 2012/06/02
@(#)$Id$