bryanoconnell.blogspot.com - Clean up old files using PowerShell

DeleteOldFiles.ps1

# |Info|
# Written by Bryan O'Connell, February 2013
# Purpose: Delete files from a folder haven't been modified for the
# specified number of days.
#
# Sample: DeleteOldFiles.ps1 -folder "C:\test" -days_old 7 [-only_this_type ".xls"]
# 
# Params:
#    -folder: The place to search for old files.
#    
#    -days_old: Age threshold. Any file that hasn't been modified for more than
#    this number of days will be deleted.
#	
#    -only_this_type: This is an optional parameter. Use it to specify that you
#    just want to delete files with a specific file extension. Be sure to 
#    include the '.' with the file extension.
#
# |Info|

[CmdletBinding()]
Param (
    [Parameter(Mandatory=$true,Position=0)]
    [string]$folder,
    
    [Parameter(Mandatory=$true,Position=1)]
    [int]$days_old,
	
    [Parameter(Mandatory=$false,Position=2)]
    [string]$only_this_type
)

#-----------------------------------------------------------------------------#

# Determines whether or not it's ok to delete the specified file. If no type 
# is specified, all files are ok to delete. If a type IS specified, only 
# files of that type are ok to delete.
Function TypeOkToDelete($FileToCheck) 
{
    $OkToDelete = $False;

    if ($only_this_type -eq $null) 
    {        
        $OkToDelete = $True;        
    }
    else 
    {        
        if ( ($FileToCheck.Extension) -ieq $only_this_type ) 
        {
             $OkToDelete = $True;
        }
    }    

    return $OkToDelete;
}

#-----------------------------------------------------------------------------#

$FileList = [IO.Directory]::GetFiles($folder);
$Threshold = (Get-Date).AddDays(-$days_old);

foreach($FileToDelete in $FileList)
{
    $CurrentFile = Get-Item $FileToDelete;
    $WasLastModified = $CurrentFile.LastWriteTime;
    $FileOkToDelete = TypeOkToDelete($CurrentFile);
    
    if ( ($WasLastModified -lt $Threshold) -and ($FileOkToDelete) )
    {
	$CurrentFile.IsReadOnly = $false;
	Remove-Item $CurrentFile;
	write-Output "Deleted $CurrentFile";
    }
}

write-Output "Press any key to quit ...";
$quit = $host.UI.RawUI.ReadKey("NoEcho, IncludeKeyDown");