xxd command

# To generate a hexdump from a binary file and display the output:
xxd <input_file>

# To generate a hexdump from a binary file and save it as a text file:
xxd <input_file> <output_file>

# To display a more compact output, replacing consecutive zeros (if any) with a star:
xxd -a <input_file>

# To display the output with 10 columns of one octet (byte) each:
xxd -c <10> <input_file>

# To display output only up to a length of 32 bytes:
xxd -l <32> <input_file>

# To display the output in plain mode, without any gaps between the columns:
xxd -p <input_file>

# To revert a plaintext hexdump back into binary, and save it as a binary file:
xxd -r -p <input_file> <output_file>