Openssl on mac -In is not working

I am follow a tutorial guide from this link http://osxdaily.com/2012/01/30/encrypt-and-decrypt-files-with-openssl/ to try to produce -sha256 hash from an input file but when i type openssl dgst -sha256 -in filename.txt the command will return unknown option '-in'. Can anyone please point out what have i gone wrong ? OS Version: 10.11 OpenSSL Version: 1.0.2.d