Well leaving aside locking issues, and the point that the
number 2 by itself is not exactly valid html, here is the
above made even shorter.
perl -MCGI -pi -e 'END{print&CGI::header,$t}s/\d+/$t=$&+1/e' c
UPDATE
And, of course, there is always a shorter way:
perl -MCGI -pi -e'END{print&CGI::header,$t}$t=++$_' c
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