using powershell to append to an existing system variable

Question

Morning everyone, This is a question specific to product licensing. We have many servers hosting licenses for engineering software that share the same variable name but on different servers. So if for instance I have an existing system variable let's say " $LM_LICENSE_FILE="server1,server2,server3" and $LM_LICENEFILE_NEW = "server4,server5,server6"

I want to append to it only if the new license variable is "different" separated by a semicolon. So if $LM_LICENSE_FILE=$LM_LICENSE _FILE_NEW Do nothing Else LM_LICENSE_FILE= $(LM_LICENSE_FILE) + ";" +(LM_LICENSE_FILE_NEW)

The value I want would be LM_LICENSE_File=server1,server2,server3;server4,servr5,server6

What would be the method to compare and append this path in powershell? Thanks, Carl G.

Researching this and I know very little about powershell outside of searching for what want and modifying. I would assume this would be a string compare and a concatenate if the strings don't match. Just don't know enough about powershell to tell people what I want.

Could make a minimal effort at solving the problem, only thing you need for this is an if condition checking for inequality -ne — Santiago Squarzon
– Santiago Squarzon, Commented Apr 11, 2023 at 15:08

jdweng · Accepted Answer · 2023-04-11 16:11:29Z

-1

Try following :

$LM_LICENSE_FILE="server1,server2,server3"
$licnesesSplit = $LM_LICENSE_FILE.Split(',')
$LM_LICENEFILE_NEW = "server1, server4,server5,server6"
$licnesesSplitnew = $LM_LICENEFILE_NEW.Split(',')
foreach($license in $licnesesSplitnew)
{
   if(-not $licnesesSplit.Contains($license))
   {
      $LM_LICENSE_FILE += ("," + $license)
   }
}
$LM_LICENSE_FILE

answered Apr 11, 2023 at 16:11

jdweng

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