if test $# = 0; then
    "$THIS_SH" "$0" 1 2 3 4 5 6 7 8 9
    exit
fi
echo 1=$1
{ echo 2=$2; }
{ echo 3=$3; } &
usleep 100000
( echo 4=$4 )
( echo 5=$5 ) &
usleep 100000
true | echo 6=$6 | cat
true | { echo 7=$7; } | cat