• file(1)
• rev(1) - reverse lines characterwise
• Tac(1) - flip upside down
• xz(1) - archiving tool
• gzip(1) - archiving tool
• uudecode(1) - decode uuencoded files

Tr will be useful for the pictures

     base64 -d will be useful

Remember you can combo commands together using the pipe “|” this will make things a lot easier.