How do execute powershell from dos command

Thx Qlemo. It works.

Can explain what does the dot in
       -command ". 'E:\Batch Jobs
means?

Also, how can the powershell script be improved to accept parameters?
Is it add

param([string]$f)
print-file $f
function print-file($file) 
...

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Using a dot in front of a script is called "dot-sourcing", If you just call a script without the dot, the script runs, and all variables and function definitions etc. are dismissed after that (to keep the results "local"). With dot, changes are "exported" to the environment of the calling script.
So, just calling the script would not allow to use the function defined in that script outside of that script.

If you want to use it that way, with a script parameter, it is better to remove the function definition. That is, you replace the script with

param($file) 
{ 
 begin  { 
    function internal-printfile($thefile) 
    { 
        if ($thefile -is [string]) {$filename = $thefile } 
        else { 
                if ($thefile.FullName -is [string] ) { $filename = $THEfile.FullName } 
             } 
        $start = new-object System.Diagnostics.ProcessStartInfo $filename 
        $start.Verb = "print" 
        [System.Diagnostics.Process]::Start($start) 
    } 

if ($file -ne $null) { 
                $filespecified = $true; 
                internal-printfile $file 
            } 
       } 
process{if (!$filespecified) { write-Host process ; internal-printfile $_ } } 

}

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and name it like the function, "Print-File.ps1" (as it is already).
Then all you need is to use the script, and supply parameters. No dot-sourceing required.

powershell -command "& 'E:\Batch Jobs\PowerShell Scripts\Print-File.ps1' -file CIS.pdf "

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However, you should do that only if do not need to call the function repeatedly, as the script gets compiled each time you call it, while a function is compiled only once and reused.
And, as you can see, we now need to use the ampersand operator, as the script path contains spaces. Without ampersand, the string describing the path would be exactly that - a string.

Thx Qlemo for explaining.

I tried as explained but when the script does not seem to be doing anything except re-printing the entire code?? I execute the script and it just return :

"param {.... }"

Thx Qlemo for the help.