Convert CSV with positive and negative lines into one with only positive lines

script.bash

# empty the file
touch positive.csv;
# loop the file
cat mixed.csv | while read line; do
  # store the 2nd column minus quotes in the variable X
  X=$(echo $line | cut -d ',' -f2 | tr -d '"');
  # if it's greater than 0, put it into the output file
  if [[ $X -gt 0 ]] then
    echo $line >> positive.csv;
  fi;
done;