set -e
{
echo 1
echo two
echo three
} | {
read x
[ "$x" = 1 ]
(read x
[ "$x" = two ])
read x
[ "$x" = three ]
}
T=`mktemp sh-test.XXXXXX`
trap 'rm -f "$T"' 0
{
echo 1
echo two
echo three
} >$T
{
read x
[ "$x" = 1 ]
(read x
[ "$x" = two ])
read x
[ "$x" = three ]
} <$T