If you ever had the need to verify the integrity of all the files in a folder, then you can use the following commands.
This command will get the SHA 512 hash for each file in the current directory and write it to the file you specify.
shasum -a 512 * > verify.txt
This command will read the contents of the file and verify each file against the SHA 512 hash stored in that file.
shasum -a 512 -c verify.txt