This deletes the fist line and the last 2 lines of input.txt and keeps a copy of the old version in input.txt.old.
perl -i.old -ne 'my $l = <>; print($l), next if $.==2; print "$_$l" un
+less eof' input.txt
Note that this is a one-liner to be run as is from the command-line (adjust your input file-name).
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