Convert variable from little endian to big endian

Working in Bash I have a hex variable that I must convert from little endian to big endian I am new to the entire concept of this and only learned about this about 20 minutes ago, so please bare with me. My script determines a hex variable that undergoes a few changes: decimal, signed 2's complement, and division by 8. Before everything though it must go through little endian to big endian conversion (I may be confusing the two but my example below should clarify) EXAMPLE: 1. Hex Value: 0080 After Conversion: 8000 2. Hex Value: 9800 After Conversion: 0098 3. Hex Value: 1234 After Conversion: 3412 I believe that this is a 16 bit hex variable as it is always 4 digits.