Not perfect, but anyway, here it is: 
perl -F, -nae '$ok?(print $last):($ok=1) if ($F[3] ne (split/,/,$last)
+[3]); $last=$_; END{print $last;}' file

[download]
If you don't mind output ordering, or if the lines for a given ID are not consecutive, then 
perl -F, -nae '$s{$F[3]}=$_; END{print values %s;}' file

[download]
(and it's simpler too).

In reply to Re: Parse file question by waldner
in thread Parse file question by mmittiga17

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