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  1. or download this
    perl -le 'print unpack("H*",pack("H*",1))'

perl -le 'print unpack("H*",pack("H*"," 1"))'

perl -le 'print unpack("H*",pack("H*","01"))'
  2. or download this
    perl -le 'print unpack("h*",pack("H*","1"))'