mkfifo fakeMFileBashPipe.m
cat > fakeMFileBashPipe.m &
mypid=$!
matlab -nosplash -nodesktop < fakeMFileBashPipe.m
###########################
# and in your Sublime build system:
echo "disp('asdf')" > fakeMFileBashPipe.m
cat [script.m] > fakeMFileBashPipe.m