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  1. or download this
     h   A hex string (low nybble first).
 H   A hex string (high nybble first).
...
hexadecimal digits.
  2. or download this
    my @hex =  $hexed =~ /([0-9a-zA-Z]+)/g;
for (@hex){
    ... pack 'H*', $_;
}
  3. or download this
    C:\>echo abcd1234 >test

...

C:\>perl -e"print pack q,H*,, $_ for @ARGV" 61 62 63 64 31 32 33 34
abcd1234