[Hash] Exam file hex

Online viewer

https://hexed.it/ 

In linux with xxd

Basic usage

• Output fa0c ect

xxd hello.txt

Binary Display

• Output 00101101 ect

xxd -b datafile.txt

Hex Upper Case

• Output FA0C ect

xxd -u datafile.txt

File signatures

• https://en.wikipedia.org/wiki/List_of_file_signatures 
• https://www.garykessler.net/library/file_sigs.html