C:\test>p1 [0] Perl> print unpack 'C*', pack 'Q>', 72623859790382856;; 1 2 3 4 5 6 7 8 [0] Perl> print unpack 'C*', pack 'Q<', 72623859790382856;; 8 7 6 5 4 3 2 1 [0] Perl> print unpack 'H*', pack 'Q<', 72623859790382856;; 0807060504030201 [0] Perl> print unpack 'h*', pack 'Q<', 72623859790382856;; 8070605040302010 [0] Perl> print unpack 'H*', pack 'Q>', 72623859790382856;; 0102030405060708 [0] Perl> print unpack 'h*', pack 'Q>', 72623859790382856;; 1020304050607080 [0] Perl> print unpack 'b*', pack 'Q>', 72623859790382856;; 10000000 01000000 11000000 00100000 10100000 01100000 11100000 00010000 [0] Perl> print unpack 'B*', pack 'Q>', 72623859790382856;; 00000001 00000010 00000011 00000100 00000101 00000110 00000111 00001000 [0] Perl> print unpack 'b*', pack 'Q<', 72623859790382856;; 00010000 11100000 01100000 10100000 00100000 11000000 01000000 10000000 [0] Perl> print unpack 'B*', pack 'Q<', 72623859790382856;; 00001000 00000111 00000110 00000101 00000100 00000011 00000010 00000001