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what happens to the rest of a file piped to head/tail?

Is it possible to cat a file, and remove the top 20 lines?
For example, 

cat /etc/file | head -20

would give me the top 20 lines of a file, however, I am really interested
in the rest of the file, however I am not certain just how many lines are
in the total file, so | tail -? would just not suffice.


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