code: def fmt(lbaf=3):
      
  
      if env():
          cij.err("cij.nvme.exists: Invalid NVMe ENV.")
          return 1
  
      nvme = cij.env_to_dict(PREFIX, EXPORTED + REQUIRED)
  
      cmd = ["nvme", "format", nvme["DEV_PATH"], "-l", str(lbaf)]
      rcode, _, _ = cij.ssh.command(cmd, shell=True)
  
      return rcode
docs: Do format for NVMe device