Function Get-LastModifiedFile {

[cmdletbinding()]

[alias("glm")]

[OutputType("System.IO.FileInfo")]

Param(

[Parameter(Position = 0, HelpMessage = "Specify a file filter like *.ps1.")]

[ValidateNotNullOrEmpty()]

[string]$Filter = "*",

[Parameter(Position = 1, HelpMessage = "Specify the folder to search.")]

[ValidateScript({

#this will write a custom error message if validation fails

If ((Test-Path -path $_ -PathType Container) -AND ((Get-Item -path $_).psprovider.name -eq 'Filesystem')) {

return $True

}

else {

Throw "The specified Path value $_ is not a valid folder or not a file system location."

return $False

}

})]

[string]$Path = ".",

[Parameter(HelpMessage = "Specify the search interval based on the last write time.")]

[ValidateSet("Hours", "Minutes", "Days", "Months", "Years")]

[string]$Interval = "Hours",

[Parameter(HelpMessage = "Specify the number of intervals.")]

[alias("ic")]

[ValidateScript({$_ -ge 1})]

[int32]$IntervalCount = 24,

[Parameter(HelpMessage = "Recurse from the specified path.")]

[switch]$Recurse

)

Write-Verbose "Starting $($myinvocation.mycommand)"

$msg ="Searching {0} for {1} files modified in the last {2} {3}." -f (Convert-Path $Path),$filter,$IntervalCount,$Interval

Write-Verbose $msg

switch ($Interval) {

"minutes" { $last = (Get-Date).AddMinutes(-$IntervalCount) }

"hours" { $last = (Get-Date).AddHours(-$IntervalCount) }

"days" { $last = (Get-Date).AddDays(-$IntervalCount) }

"months" { $last = (Get-Date).AddMonths(-$IntervalCount) }

"years" { $last = (Get-Date).AddYears(-$IntervalCount) }

}

Write-Verbose "Cutoff date is $Last"

#remove bound parameters that don't belong to Get-ChildItem

"IntervalCount", "Interval" | ForEach-Object {

if ($PSBoundParameters.ContainsKey($_)) {

[void]$PSBoundParameters.Remove($_)

}

}

#add -File to PSBoundParameters

$PSBoundParameters.Add("file", $True)

if ($recurse) {

Write-Verbose "Recursing..."

}

else {

Write-Verbose "Searching..."

}

#get the files and filter on the LastWriteTime using the Where() method for

#better performance

(Get-ChildItem @PSBoundParameters).Where({$_.LastWriteTime -ge $last})

Write-Verbose "Ending $($myinvocation.mycommand)"

}