fix bug

tasks/bcftools1.wdl

@@ -9,7 +9,10 @@ task bcftools {
 		set -o pipefail
 		set -e
 		mkdir -p /cromwell_root/tmp/bcftools
-		echo $vcf > b
+		for i in ${sep=" " vcf}
+		do
+			echo $i > b
+		done
 	>>>
 
 	runtime {