generate Hash of file

The download directory also contains the Release Notes for that version of FreeNAS®. This file contains the changes introduced by that release, any known issues, and the SHA256 checksums of the files in the download directory. The command you use to verify the checksum varies by operating system:

• on a BSD system use the command sha256 name_of_file

• on a Linux system use the command sha256sum name_of_file

• on a Mac system use the command shasum -a 256 name_of_file

• on a Windows system or Mac system, you can install a utility such as HashCalc or HashTab

 

http://www.slavasoft.com/hashcalc/

http://implbits.com/HashTab.aspx