#   This program is free software: you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation, either version 3 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

set +o posix
shopt -u xpg_echo

echo $SHELLOPTS
set +B	# on by default
# shouldn't appear
echo $SHELLOPTS | grep braceexpand
export SHELLOPTS
# but it will appear here because it's enabled by default
${THIS_SH} -c 'echo $SHELLOPTS'

# turn off an option that's on by default
${THIS_SH} +B -c 'echo $SHELLOPTS'
${THIS_SH} +o braceexpand -c 'echo $SHELLOPTS'

# turn on an option that's off by default
if ${THIS_SH} -f -c 'echo $SHELLOPTS' | grep noglob 2>&1; then
	:
else
	echo 'SHELLOPTS: noglob not inherited correctly'
fi

# in a different way
set -o noglob
if ${THIS_SH} -c 'echo $SHELLOPTS' | grep noglob 2>&1; then
	:
else
	echo 'SHELLOPTS: noglob not inherited correctly'
fi

# restore default state
set -o braceexpand
set +o noglob

# but assigning to SHELLOPTS is an error; have to use set -o/+o
SHELLOPTS=$SHELLOPTS