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macOS's od command fails to display 64-bit signed integers correctly. Compare the outputs from the native od command and from the GNU od command below. The command shows no error messages. The man page of the native od indicates that it supports -t d8 . The binary file is a list of 64-bit integers, increasing from 0 by 1: 0, 1, 2, 3, . . . and the od -x correctly shows that (not shown here). What am I missing? It's hard to believe that such a basic command includes such an obvious bug, if it really is a bug, that is. macOS 13.3.1, mac mini (2023). Here is the comparison. The native od seems to interpret the sequence of bytes as if it were 8-bit int, ignore, ignore, ignore, 8-bit int, ignore, ignore, ignore, . . . (Note that the disk image is little endian.) (I've shortened some of the lines as there were too many blanks per line.) ~/tmp $ /usr/bin/od -t d8 tmp.bin | head -70 | tail -10 0001700 120 121 0001720 122 123 0001740 124 125 0001760 126 127 0002000 -128 -127 0002020 -126 -125 0002040 -124 -123 0002060 -122 -121 0002100 -120 -119 0002120 -118 -117 ~/tmp $ god -t d8 tmp.bin | head -70 | tail -10 0001700 120 121 0001720 122 123 0001740 124 125 0001760 126 127 0002000 128 129 0002020 130 131 0002040 132 133 0002060 134 135 0002100 136 137 0002120 138 139