Don't infinite loop with:
unset var
echo ${var:=}

Fix PR/2070: Ksh style variable modifiers were broken in /bin/sh, from
enami tsugutomo

Fixed new bug the previous fix introduced:

false
foo=bar
echo $?

would print 1
Also fixed the long standing bug:

false
echo `echo $?`

would print 0
The exitstatus needs rethin

Fixed new bug the previous fix introduced:

false
foo=bar
echo $?

would print 1
Also fixed the long standing bug:

false
echo `echo $?`

would print 0
The exitstatus needs rethinking and rewriting. The trial and error method
is not very efficient

show more ...

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

convert to new RCS id conventions.

Oops... typo in the IFS previous fix.

Changed so that backquote expansion eats all trailing newlines, not just
the last one.
Reported by guido@gvr.win.tue.nl (Guido van Rooij).
Repeat By:

echo "`cat file-with-many-newlines`"

Changed IFS string-splitting so that it breaks spaces even when IFS does not
begin with a space, but contains one. Fixes PR bin/809.

#!/bin/sh
list="a b c "
echo "With ordin

Changed IFS string-splitting so that it breaks spaces even when IFS does not
begin with a space, but contains one. Fixes PR bin/809.

#!/bin/sh
list="a b c "
echo "With ordinary IFS"
for i in $list;do
echo $i
done
IFS=":${IFS}"
echo "With changed IFS"
for i in $list;do
echo $i
done

Note that before the fix ":${IFS}" behaved differently than "${IFS}:".

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I added the documented in the manual but not implemented variable expansions:

${#WORD}
${WORD%PAT}
${WORD%%PAT}
${WORD#PAT}
${WORD##PAT}

from James Jegers <jimj@miller.cs.uwm.edu>: quiet -Wall, and squelch
some of the worst style errors.

Fix problem with character classes matching a terminating NUL, from Henry
Spencer.

Add RCS ids.

Include appropriate header files to bring function prototypes into scope.

sync with 4.4lite

Last patch was wrong; just save argbackq around the argstr() call.

evalvar(): If subtype is VSASSIGN (or VSQUESTION), argstr() already rolled
forward the backquote queue. If VSQUESTION it doesn't matter because we
already exited with an error.

Add RCS identifiers.

Jim "wilson@moria.cygnus.com" Wilson's patches to make C News (and other
things) work.

changed "Id" to "Header" for rcsids

added rcs ids to all files

initial import of 386bsd-0.1 sources