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#!/usr/bin/env perl -l

...
$pm->wait_all_children;

print 'Link checking completed.';

$ pm_1199760_parallel_forkmgr_link_checker.pl
Start link checking.
...
  MOD: 0
FAIL: http://www.pixunlimited.co.uk/siteheaders/Guardian.gif
Link checking completed.

$ pm_1199760_parallel_forkmgr_link_checker.pl 1
Start link checking.
...
FAIL: http://www.guardian.co.uk/
FAIL: http://www.pixunlimited.co.uk/siteheaders/Guardian.gif
Link checking completed.