Unable to get output from get-filehash

Question

I am looking for a reliable command-line method of getting SHA256 hashes for files in Windows. My understanding is that the way to do this is via Microsoft\'s Get-FileHash

Answer 1

Get-FileHash, requires Windows PowerShell 4.0 Based on your comments you are at version 3, which is default on Win 2012 (non R2) Here how to check you PS version

You can update PS on Win 2012 (non R2) to version 4.0 or use Win 2012 R2

If you just run Get-FileHash on a PS version 3 system you should get

PS C:\> Get-FileHash
Get-FileHash : The term 'Get-FileHash' is not recognized as the name of a cmdlet, function, script file, or operable
program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:1
+ Get-FileHash
+ ~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Get-FileHash:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

On lower PS version you can use this function

Function Get-FileHashTSO([String] $FileName,$HashName = "SHA1") 
{
$FileStream = New-Object System.IO.FileStream($FileName,[System.IO.FileMode]::Open) 
$StringBuilder = New-Object System.Text.StringBuilder 
[System.Security.Cryptography.HashAlgorithm]::Create($HashName).ComputeHash($FileStream)|%{[Void]$StringBuilder.Append($_.ToString("x2"))} 
$FileStream.Close() 
$StringBuilder.ToString() 
}

store it as .ps (e.g. Get-FileHashTSO.ps1) file and call it like this

powershell -command "& { . C:\myScripts\Get-FileHashTSO.ps1 ; Get-FileHashTSO "C:\someLocation\someFile.iso" "SHA1" }"