http://linux-news.org/index.php/2011/12/09/top-10-wireshark-filters/

sprintfの戻り値 $ perl -e 'print sprintf "%d\n", 1;' 1 $ perl -e 'print sprintf "%d\n", 2;' 2 $ perl -e 'print sprintf "%d\n", 3;' 3 $ perl -e 'print sprintf "%d\n", 0;' 0 $ perl -e 'print sprintf "%d\n", "";' 0 $ perl -e 'print sprintf "%…