with_template.sh

file=$0
output="output.file"
from_b=`tail -r ${file}|grep -n .|grep "#### template"|head -1|grep -o "[0-9]*"`
cat ${file}|tail -${from_b} > "${output}"
eval echo "\"$(cat ${output})\"" > "${output}"

// do something

exit 0

#### template-begin(unique strings)
foo
bar
baz
\$file #will not be evaluated
$file  #will be evaluated