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echo -e '55\n44\n33\n22\n11\n' | perl -n -e '@a = ($_,<>); END{ print +@a; } ' echo -e '55\n44\n33\n22\n11' | perl -n -e '@a = ($_,<>); END{ print @a +; } '
echo -en '55\n44\n33\n22\n11\n' | perl -n -e '@a = ($_,<>); END{ print + @a; } '