I'd rather write the PID of your cronscript to that tempfile, so you can check right away if the process is still running or not, by matching ps $(cat tempfile).

So in your cron script you do something like:

Code:

doit=false
[[ ! -f tempfile ]] && doit=true
[[ -f tempfile ]] && [[ ! $(ps $(cat tempfile) ]] && doit=true

if [[ $doit ]];then
      echo $$ > tempfile

      echo "your code"

      rm -f tempfile
fi

Hope this helps

NOTE: For cron scripts you need to write full paths to commands, not like this example!