How to create a hex dump of file containing only the hex characters without spaces in bash?

Question

How do I create an unmodified hex dump of a binary file in Linux using bash? The od and hexdump commands both insert spaces in the

Answer 1

Format strings can make hexdump behave exactly as you want it to (no whitespace at all, byte by byte):

hexdump -ve '1/1 "%.2x"'

1/1 means "each format is applied once and takes one byte", and "%.2x" is the actual format string, like in printf. In this case: 2-character hexadecimal number, leading zeros if shorter.