Look at the header of the file. You should see something like this:
Code:
--
-- Copyright (c) 1983, 1998 by Oracle Corporation. All Rights Reserved.
--
-- NAME
--   helpbld.sql
--
-- DESCRIPTION
--   Builds the SQL*Plus HELP table and loads the HELP data from a
--   data file.  The datafile must exist before this script is run.
--
-- NOTES
--   To run this script, connect as SYSTEM and pass the datafile to be
--   loaded as a parameter e.g.
--
--       sqlplus system/ @helpbld.sql helpus.sql
--
--