Same as @Altered-Ego but with txt.file:
Get-Content "C:\ServerList.txt"
machineA,machineB,machineC,machineD
$ServerList = Get-Content "C:\ServerList.txt"
$currentTrustHost=(get-item WSMan:\localhost\Client\TrustedHosts).value
if ( ($currentTrustHost).Length -gt "0" ) {
$currentTrustHost+= ,$ServerList
set-item WSMan:\localhost\Client\TrustedHosts –value $currentTrustHost -Force -ErrorAction SilentlyContinue
}
else {
$currentTrustHost+= $ServerList
set-item WSMan:\localhost\Client\TrustedHosts –value $currentTrustHost -Force -ErrorAction SilentlyContinue
}
The "-ErrorAction SilentlyContinue" is required in old PS version to avoid fake error message:
PS C:\Windows\system32> get-item WSMan:\localhost\Client\TrustedHosts
WSManConfig: Microsoft.WSMan.Management\WSMan::localhost\Client
Type Name SourceOfValue Value
---- ---- ------------- -----
System.String TrustedHosts machineA,machineB,machineC,machineD