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# make sure we have a way of checking these things
cd /proc/$$/fd || cd /dev/fd || exit 1
[ -e 44 ] && exit 1
exec 44>/dev/null
[ -e 44 ] || exit 1
echo pass fd out open
[ -e 55 ] && exit 1
exec 55>&44
[ -e 55 ] || exit 1
echo pass fd out dup
exec 44>&-
[ -e 44 ] && exit 1
echo pass fd out close
[ -e 66 ] && exit 1
exec 66</dev/null
[ -e 66 ] || exit 1
echo pass fd in open
[ -e 77 ] && exit 1
exec 77<&66
[ -e 77 ] || exit 1
echo pass fd in dup
exec 66<&-
[ -e 66 ] && exit 1
echo pass fd in close
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