> For the complete documentation index, see [llms.txt](https://docs.collibra.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.collibra.com/data-quality-self-hosted/core-concepts/findings/data-quality-monitors/job-tab/job-command-line-parameters/advanced/nulls-in-datasets.md).

# Nulls in Datasets

## Example

```
./owlcheck \
-ds "datataset_date_column" \
-rd "2019-07-01" \
-f "/Users/Downloads/csv2/2019010.csv" \
-zfn \
-nulls "N.A."   
```

Zero if null will replace null values with zero.

```
-zfn  
```

To replace characters that represent a null to actual null values.

```
-nulls "N.A."
```