% file unknownbinary.dat

unknownbinary.dat: Berkeley DB 2.X Hash/Little Endian
(Version 5, Logical sequence number: file - 0, offset - 0,
Bucket Size 4096, Overflow Point 10, Last Freed 647, Max
Bucket 974, High Mask 0x3ff, Low Mask 0x1ff, Fill Factor 0,
Number of Keys 16238)

% file anotherbinary.dat

anotherbinary.dat: GIF image data, version 89a, 19 x 45,