Remove unused variables.
Fixes the sh(1) build when DEBUG is enabled.

It was twenty(-two) years ago today
J.T. Conklin told us not this way
Berkeley 4.4 lite's changed which file
And it's traced differently all this while

Even more debugging improvements (from kre)

Bug fixes to handling of unterminated here documents
(they should be, and now are, a syntax error), and
miscellaneous other minor cleanups. (from kre)

More nodenames fixes.

Improve debugging, from kre (I hooked it to the build).

- add pid to the trace file so that we don't keep overwriting ourselves
- use va_copy to print the trace arguments so that we don't deplete it for the real printf

don't core-dump if we cannot open the trace file.

This seems to need stdlib.h to get a prototype for abort().

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22249, verified by myself.

Support command -p, -v and -V as posix
Stop temporary PATH assigments messing up hash table
Fix sh -c -e "echo $0 $*" -a x (as posix)
(agreed by christos)

Fixes from David Laight:
- ansification
- format of output of jobs command (etc)
- job identiers %+, %- etc
- $? and $(...)
- correct quoting of output of set, export -p and readonly -p
- differentia

Fixes from David Laight:
- ansification
- format of output of jobs command (etc)
- job identiers %+, %- etc
- $? and $(...)
- correct quoting of output of set, export -p and readonly -p
- differentiation between nornal and 'posix special' builtins
- correct behaviour (posix) for errors on builtins and special builtins
- builtin printf and kill
- set -o debug (if compiled with DEBUG)
- cd src obj (as ksh - too useful to do without)
- unset -e name, remove non-readonly variable from export list.
(so I could unset -e PS1 before running the test shell...)

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__STDC__ is always defined on NetBSD, so remove #ifdef __STDC__ (and
unnecessary #else cases).

implement noclobber. From Ben Harris, with minor tweaks from me. Two
unimplemented comments to go. Go Ben!

back this directory up a day, systems won't even boot (rc.subr splodes)

suggested back-to-the-drawing-board test: $ echo "${PWD:-notlikely}"

Fix off by one in the display of var trees.

Sprinkle some `const's in DEBUG bracketed code.

PR/4966: Joel Reicher: Implement <> redirections which are documented in
the man page.

Remove local declaration of getenv();

Fix compiler warnings.

Use #ifdef __STDC__ instead of #if __STDC__

kill 'register'

PR/2808: Don't define DEBUG and #ifdef out functions not needed when DEBUG
is not defined (from FreeBSD).

Merge in my changes from vangogh, and fix the x=`false`; echo $? == 0
bug.

convert to new RCS id conventions.