correct detecting cellragner version

        echo "Error: option -t is required"

        exit 1

    fi

    DIR=`which /home/tom/local/bin/cellranger-2.1.0/cellranger`

    DIR=`which cellranger`

    VERSION=`cellranger count --version | head -n 2 | tail -n 1 | cut -d"(" -f2 | cut -d")" -f1`

    if [[ ! -w ${DIR}-cs/${VERSION}/lib/python/cellranger/barcodes ]]

        then