Public/Get-NewestFileVersionCompatible.ps1
|
function Get-NewestFileVersion { <# .SYNOPSIS Analyzes file version information and identifies the newest version of each unique filename. .DESCRIPTION The Get-NewestFileVersion function processes file paths or FileInfo objects to extract version information and group files by their filename. For each unique filename, it identifies which instance has the newest version (or most recent LastWriteTime if version info is unavailable). This function is designed to work seamlessly with Find-FileRecursive or Get-ChildItem to help identify version conflicts when multiple copies of the same DLL or executable exist across different directories. .PARAMETER Path Specifies the path(s) to files to analyze. Accepts: - String paths (e.g., "C:\Windows\System32\kernel32.dll") - Arrays of string paths - FileInfo objects from Get-ChildItem or Find-FileRecursive - Pipeline input from any command that outputs file paths or FileInfo objects This parameter accepts pipeline input and can be bound by property name (FullName, PSPath). .PARAMETER SkipFilesWithoutVersion When specified, files that do not contain embedded version information will be excluded from the results. By default, files without version info are included and sorted by LastWriteTime. .PARAMETER AsHashTable When specified, returns the results as a hashtable instead of an array of PSCustomObjects. The filenames are stored as keys, and the full details are stored as PSCustomObjects in the hashtable item values. This format is useful for quick lookups by filename or for programmatic access to specific file version data. .INPUTS System.String[] System.IO.FileInfo[] You can pipe file paths (strings) or FileInfo objects to Get-NewestFileVersion. .OUTPUTS PSCustomObject[] (default) System.Collections.Hashtable (when -AsHashTable is specified) Default output is an array of custom objects with the following properties: - FileName: The name of the file (e.g., "kernel32.dll") - NewestVersion: The file version of the newest instance (e.g., "10.0.19041.1") - NewestPath: Full path to the file with the newest version - LastWriteTime: The LastWriteTime of the newest file - HasVersionInfo: Boolean indicating if the newest file has version information - TotalInstancesFound: Count of all instances of this filename found - FilesWithVersion: Count of instances that have version information - FilesWithoutVersion: Count of instances without version information - AllVersions: Array of all unique versions found, sorted descending - AllPaths: Array of full paths to all instances of this filename When -AsHashTable is specified, returns a hashtable where keys are filenames and values are the PSCustomObjects described above. .EXAMPLE Find-FileRecursive -Path "C:\Program Files" -FilePattern "Microsoft.Identity.Client.dll" -Parallel | Get-NewestFileVersion Searches for all instances of a DLL across 'Program Files' and identifies the newest version. .EXAMPLE $ModulePaths = $env:PSModulePath -split [System.IO.Path]::PathSeparator $Results = Find-FileRecursive -Path $ModulePaths ` -FilePattern @('Microsoft.Identity*.dll', 'Microsoft.IdentityModel*.dll') -Parallel | Get-NewestFileVersion $Results | Format-Table FileName, NewestVersion, TotalInstancesFound, NewestPath -AutoSize Finds all Microsoft Identity-related DLLs across PowerShell module paths, groups them by filename, and displays a summary table showing the newest version of each. .EXAMPLE $ModulePaths = $env:PSModulePath -split [System.IO.Path]::PathSeparator $VersionMap = Find-FileRecursive -Path $ModulePaths -FilePattern 'Microsoft.Identity*.dll' -Parallel | Get-NewestFileVersion -AsHashTable $VersionMap['Microsoft.Identity.Client.dll'] $VersionMap['Microsoft.Identity.Client.dll'].NewestVersion $VersionMap['Microsoft.Identity.Client.dll'].NewestPath Returns results as a hashtable for quick lookups. You can access version information for any specific filename directly using the hashtable key. .NOTES Requires: PowerShell 5.1+ The function uses FileVersionInfo to read embedded version information from executables and DLLs. If a file does not have version information, it falls back to using LastWriteTime for comparison unless -SkipFilesWithoutVersion is specified. When comparing versions, the function attempts to parse FileVersion as a [version] object for accurate semantic version comparison. If parsing fails, it falls back to LastWriteTime. The -AsHashTable parameter is useful when you need O(1) lookup performance for specific filenames or when building version comparison logic in scripts. #> [CmdletBinding()] param ( [Parameter(Mandatory = $true, ValueFromPipeline = $true, ValueFromPipelineByPropertyName = $true)] [Alias('FullName', 'PSPath')] [object[]]$Path, [Parameter(Mandatory = $false)] [switch]$SkipFilesWithoutVersion, [Parameter(Mandatory = $false)] [switch]$AsHashTable ) begin { $FileGroups = @{} } process { foreach ($Item in $Path) { # Determine file path from input type if ($Item -is [System.IO.FileInfo]) { $FilePath = $Item.FullName } elseif ($Item -is [string]) { $FilePath = $Item } else { $FilePath = $Item.ToString() } try { # Get FileInfo object if ($Item -is [System.IO.FileInfo]) { $FileInfo = $Item } else { $FileInfo = Get-Item -LiteralPath $FilePath -ErrorAction Stop } $FileName = $FileInfo.Name try { $VersionInfo = [System.Diagnostics.FileVersionInfo]::GetVersionInfo($FileInfo.FullName) $HasVersion = -not [string]::IsNullOrWhiteSpace($VersionInfo.FileVersion) if ($SkipFilesWithoutVersion -and -not $HasVersion) { Write-Verbose "Skipping file without version: $($FileInfo.FullName)" continue } $FileData = [PSCustomObject]@{ FullName = $FileInfo.FullName Name = $FileName FileVersion = if ($HasVersion) { $VersionInfo.FileVersion } else { $null } ProductVersion = if (-not [string]::IsNullOrWhiteSpace($VersionInfo.ProductVersion)) { $VersionInfo.ProductVersion } else { $null } LastWriteTime = $FileInfo.LastWriteTime Length = $FileInfo.Length HasVersionInfo = $HasVersion } if (-not $FileGroups.ContainsKey($FileName)) { $FileGroups[$FileName] = New-Object System.Collections.Generic.List[object] } $FileGroups[$FileName].Add($FileData) } catch { Write-Warning "Could not read version info for: $($FileInfo.FullName) - $($_.Exception.Message)" if (-not $SkipFilesWithoutVersion) { $FileData = [PSCustomObject]@{ FullName = $FileInfo.FullName Name = $FileName FileVersion = $null ProductVersion = $null LastWriteTime = $FileInfo.LastWriteTime Length = $FileInfo.Length HasVersionInfo = $false } if (-not $FileGroups.ContainsKey($FileName)) { $FileGroups[$FileName] = New-Object System.Collections.Generic.List[object] } $FileGroups[$FileName].Add($FileData) } } } catch { Write-Warning "Could not access file: $FilePath - $($_.Exception.Message)" } } } end { if ($AsHashTable) { $ResultHashTable = @{} foreach ($FileName in $FileGroups.Keys) { $Files = $FileGroups[$FileName] $Newest = $Files | Sort-Object -Descending -Property { if ($_.HasVersionInfo -and $_.FileVersion) { try { [version]$_.FileVersion } catch { $_.LastWriteTime } } else { $_.LastWriteTime } } | Select-Object -First 1 $ResultHashTable[$FileName] = [PSCustomObject]@{ FileName = $FileName NewestVersion = $Newest.FileVersion NewestPath = $Newest.FullName LastWriteTime = $Newest.LastWriteTime HasVersionInfo = $Newest.HasVersionInfo TotalInstancesFound = $Files.Count FilesWithVersion = @($Files | Where-Object { $_.HasVersionInfo }).Count FilesWithoutVersion = @($Files | Where-Object { -not $_.HasVersionInfo }).Count AllVersions = @($Files | Where-Object { $_.HasVersionInfo } | Select-Object -ExpandProperty FileVersion -Unique | Sort-Object -Descending) AllPaths = $Files.FullName } } $ResultHashTable } else { foreach ($FileName in ($FileGroups.Keys | Sort-Object)) { $Files = $FileGroups[$FileName] $Newest = $Files | Sort-Object -Descending -Property { if ($_.HasVersionInfo -and $_.FileVersion) { try { [version]$_.FileVersion } catch { $_.LastWriteTime } } else { $_.LastWriteTime } } | Select-Object -First 1 [PSCustomObject]@{ FileName = $FileName NewestVersion = $Newest.FileVersion NewestPath = $Newest.FullName LastWriteTime = $Newest.LastWriteTime HasVersionInfo = $Newest.HasVersionInfo TotalInstancesFound = $Files.Count FilesWithVersion = @($Files | Where-Object { $_.HasVersionInfo }).Count FilesWithoutVersion = @($Files | Where-Object { -not $_.HasVersionInfo }).Count AllVersions = @($Files | Where-Object { $_.HasVersionInfo } | Select-Object -ExpandProperty FileVersion -Unique | Sort-Object -Descending) AllPaths = $Files.FullName } } } } } |