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  1. or download this
    $ perl -E'say 0x64 == hex("64") ?"yes":"no"'
yes
  2. or download this
    $ perl -E'say "\x64" eq chr(hex("64")) ?"yes":"no"'
yes

$ perl -E'say "\x64" eq chr(0x64) ?"yes":"no"'
yes
  3. or download this
    $ perl -E'say "\x64" eq pack("C", hex("64")) ?"yes":"no"'
yes

$ perl -E'say "\x64" eq pack("C", 0x64) ?"yes":"no"'
yes