docs: def _get_db_password(dbSystem,db,user):
      """Read through the users .dbrc file to get password for the db/user
      combination suplied.  If no password is found then prompt for one
      """
      import string, getpass, os
      dbrc = os.environ['HOME']+"/.dbrc"
      password={}
      if os.access(dbrc,os.R_OK):
          fd=open(dbrc)
          lines=fd.readlines()
          for line in lines:
              entry=line.split()
              if entry[0]==dbSystem and entry[1]==db and entry[2]==user:
                  return entry[3]
  
      return getpass.getpass()