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my $string = pack('a*','123456');
foreach (my $i=0; $i<length($string); $i++) { printf("%02x ", substr($
+string,$i,1)); }
print "\n";

Select or download this

$string .= pack('a', 0x1c);
foreach (my $i=0; $i<length($string); $i++) { printf("%02x ", substr($
+string,$i,1)); }
print "\n";