$ gemmi sg -h
Usage:
 gemmi sg [options] SPACEGROUP[...]
Prints information about the space group.
  -h, --help     Print usage and exit.
  -V, --version  Print version and exit.
  -v, --verbose  Verbose output.
  --asu=N        Draw ASU in NxNxN map grid and exit. Uses N(N+1) columns.