npm install -g nodejs-hashsum-file-checker
or, if you're getting "Missing write access" error, try adding a sudo:
sudo npm install -g nodejs-hashsum-file-checker
hashsum-file-checker filePath [algorithm]
hashsum-file-checker test.txt md5 - return md5 hash-sum for test.txt file.
hashsum-file-checker test.txt - return all available hash-sums for test.txt