Header of a file

[Tim <helycos@lycos.co.uk>]

Quick question, I've been asked to post the header of a file.  Fair 
confession, I'm an end-user not a developer, so don't know what is being 
referred to.  How do I find this?  Its not binary so I can post the 
entire file.  And ls -l.  Am I on the right track?

TIA, Tim