added note for Write-Output func

Tools.ps1

@@ -54,6 +54,9 @@ Function Setup-LogFile {
 }
 
 # Log a message to the log file
+# IMPORTANT: In Powershell 'echo' is an alias for Write-Output, which is overriden when this Tools.ps1 file is called before your script.
+#            To prevent unwanted behavior, if you need to echo something do the following instead:
+#              Start-Process "cmd.exe" -ArgumentList '/C echo y | some-command'
 Function Write-Output {
     param([Parameter(Mandatory=$true,ValueFromPipeline=$true)][string]$Message)
     $Timestamp = Get-Date -Format "yyyy-MM-dd HH:mm:ss"