Mine

#! /bin/shdir="/home/nevan/test/bin"home="/home/nevan/Scrivania/testing"exe="testing"  ps x > $home/pswr.txt  grep $exe $home/pswr.txt > $home/ps2r.txt  rm $home/pswr.txt  if test -s $home/ps2r.txt  then    echo "Ok"    rm $home/ps2r.txt    exit 0  fi  echo "Down, Restart"  rm $home/ps2r.txtecho "Restart...."cd $dirdate > $home/startr.txt/usr/bin/screen -DmS testing $dir/$exe &> $home/test.logecho "done"exit 1