#   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/>.
#
cd ${TMPDIR:=/var/tmp}
rm -f u

${THIS_SH} -c 'exec 10>&1; echo fd 10 >&10' 10>u
cat u
rm -f u

${THIS_SH} -c 'exec 8>&1; echo fd 8 >&8' 8>u
cat u
rm -f u

# command preceding exec acts as if `command' isn't there
${THIS_SH} -c 'command exec 10>&1; echo fd 10 >&10; echo next fd' 10>u
cat u
rm -f u

exec 10>u
exec 10>&1; echo 'fd 10' >&10
cat u
rm -f u
exec 10>&-

exec 8>u
exec 8>&1; echo 'fd 8' >&8
cat u
rm -f u
exec 8>&-

rm -f infile
cat > infile <<EOF
1
2
3
4
EOF

exec 7<&0
exec 10<infile
exec 0<&10; cat <&10
exec 0<&7
exec 7<&-

exec 7<&0
exec 8<infile
exec 0<&8 ; cat <&8
exec 0<&7
exec 7<&-

exec 7<&0
exec 0</dev/null
exec 10<infile
exec 10<&0; cat <&10
exec 0<&7
exec 7<&-

exec 7<&0
exec 0</dev/null
exec 8<infile
exec 8<&0; cat <&8
exec 0<&7
exec 7<&-

rm -f infile

cd $OLDPWD
exit 0
