Write-LogFile

Here is a function to allow a script to log its execution.
Output data into a log file. Options for path, extension and overwrite.

function Write-LogFile { 
<# 
    .SYNOPSIS 
        Output data into a log file. 
    .DESCRIPTION 
        Output data into a log file. Options for path, extension and overwrite. 
    .PARAMETER  LogData 
        Data to be logged. 
     .PARAMETER  FolderPath 
        Path of the folder to store the log file in. 
     .PARAMETER  Extension 
        Use a different file extension other than .log . 
     .PARAMETER  Overwrite 
        Specify to overwrite existing log file. 
     .EXAMPLE 
        PS C:\> Write-LogFile -LogData $string -FolderPath 'C:\Logs' -Overwrite 
     .EXAMPLE 
        PS C:\> $string | Write-LogFile -FolderPath 'C:\Logs' -Extension 'txt' 
 #> 
     [CmdletBinding()] 
    param( 
        [Parameter(Position=0, Mandatory=$true, ValueFromPipeline=$true, HelpMessage="Data to be logged")] 
        [ValidateNotNullOrEmpty()] 
        [String] 
        $LogData, 
        [Parameter(Position=1, Mandatory=$true, HelpMessage="Path of the folder to store the log file in")] 
        [ValidateNotNullOrEmpty()] 
        [String] 
        $FolderPath = 'D:\LOGS', 
        [Parameter(Position=2)] 
        [String] 
        $Extension = 'log', 
        [Parameter(Position=3)] 
        [Switch] 
        $Overwrite 
    ) 
    process { 
         try  
        {     
            $Filename = [string](Get-Date -format yyyyMMdd) + '.' + $Extension 
             
            if ($Overwrite){     
            $LogData | Out-File $FolderPath\$Filename 
            } 
            else { 
            $LogData | Out-File $FolderPath\$Filename -Append 
            }     
        } 
         catch [System.IO.DirectoryNotFoundException] 
        { 
        Write-Host "The FolderPath $FolderPath does not exist. Please use a valid folder to store the log file in."  -ForegroundColor Red
        } 
    } 
}