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I wold recommend forming the habit of enclosing the whole sed program string in single quotes. They you can use spaces within it and very much improve readability. Multiple commands can be separated with semi-colons:
My first thought was: sed -n '/The Third/,$p' myFile. But I doubt that the myFile example given in your first post is accurate.
Maybe you could post a relevant part of the myFile (replacing possible privacy sensitive stuff) and give us a larger view of what it is you are trying to do.
About the -n option: As you probably found out the -n (suppress normal output) and p (print current pattern space) option kinda go together and is probably what you want to use to cut out parts of the large infile.
... You might want to do this is you have a very massive file and don't have room to create a temp file for the output.
One needs to be careful here if one is cramped for space: my version of sed will create the temporary file itself if this option is specified:
This option specifies that files are to be edited in-place. GNU
`sed' does this by creating a temporary file and sending output to
this file rather than to the standard output.(1) ...
-- excerpt from info sed
The in-place term is something of a misnomer here, because it refers to the final result, not the mode of operation ... cheers, makyo