#   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/>.
#
: ${TMPDIR:=/var/tmp}
SHELLSFILE=$TMPDIR/shells-$$

cat > $TMPDIR/shells-$$ <<EOF
/bin/bash
/bin/csh
/bin/ksh
/bin/sh
/bin/tcsh
/bin/zsh
EOF

oclosev()
{
exec {v}>&-
}

iclosev()
{
exec {v}<&-
}

exec {v}>&1
echo $v

echo foo 1 >&$v
echo foo 2 >&$v
echo foo 3 >&$v

oclosev

exec {v}<$SHELLSFILE
echo $v

while read line <&$v
do
	echo $line
done

iclosev

type oclosev
type iclosev

while read -r -u ${fd}
do
	echo $REPLY
done {fd}<$SHELLSFILE

rm -f $SHELLSFILE

exit 0