busybox

# This creates 120k heredoc

echo 'cat <<HERE | md5sum' >"$0.tmp"

yes "123456789 123456789 123456789 123456789" | head -3000 >>"$0.tmp"

echo 'HERE' >>"$0.tmp"

​

yes "123456789 123456789 123456789 123456789" | head -3000 | md5sum

. "$0.tmp"

rm "$0.tmp"

echo End