Verify sha256 checksum

How to verify sha256 checksum:


So, you have filename(whose checksum needs to be verified) and
its checksum file as filename-CHECKSUM.

# ls  -l
filename
filename-CHECKSUM


You can use the command
# sha256sum    -c   filename-CHECKSUM.

Where -c stands for:
  -c, --check          read SHA256 sums from the FILEs and check them