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I couldn’t understand what exactly “W” do.
my $x = "this is my string";
print unpack("W",substr($x,0,1));
Prints: 116
my $x = "this is my string";
print unpack("W",$x);
Still Prints: 116
From perldoc:
W An unsigned char value (can be greater than 255).Both of your examples return the same thing because your unpack argument
"W"only consumes one character. Try"W*"instead.