Rewrite last line in text file

From: Magnus Oskarsson (magnus.oskarsson_at_enera.se)
Date: 10/16/03 

Date: Thu, 16 Oct 2003 09:10:53 +0200

I have a (potentially large) text file where I sometimes want to write a new
line (at the end), and sometimes replace the last line with a new one (the
new line is never shorter than the old one if that is of any help). Is there
an easy way to do the latter? Note: I do not want to have to rewrite the
entire file each time or to have to parse the file from the beginning, this
must be efficient.

Regards

Magnus Oskarsson

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