#### Usage
$ open-choppy-env
$ choppy install YaqingLiu/bcftools

#### Input File
Input file should be in the form of json.
For example:
```
{
	"vcf": [
          "oss://choppy-cromwell-result/test-choppy/..._pon.vcf",
          "oss://choppy-cromwell-result/test-choppy/..._pon.vcf",
          "oss://choppy-cromwell-result/test-choppy/..._pon.vcf"
        ],
	"sample_id": "somatic_normal"
}
```