Downloaded 2019 Aug 29 from https://bitbucket.org/gavinband/bgen/src/default/example/

plink2 --bgen example.bgen --sample example.sample --make-pgen  --out example
plink2 --bgen example.bgen --sample example.sample --make-bed  --out example
plink2 --bgen example.bgen --sample example.sample --make-ped  --out example

plink1.9 --bfile example --recode # for uncompressed

+ ------ +

group1 and group2 were generated by
  plink1.9 --dummy 100 200 scalar-pheno
