Be aware of the familiar traps that perl programmers of various hues
fall into. See L<perltrap>.
-If what you see looks like a Perl error message, check L<perldiag>
-to see what the message means. If it looks like an error from
-your operating system, consult your operating system documentation.
+Check in L<perldiag> to see what any Perl error message(s) mean.
+If message isn't in perldiag, it probably isn't generated by Perl.
+Consult your operating system documentation instead.
If you are on a non-UNIX platform check also L<perlport>, some
features may not be implemented or work differently.