PowerShell Notes

Delete Empty Files

• Delete all empty files in the current directory:

  dir -file | where {$_.Length -eq 0} | del [-WhatIf]

Find Hotkey Files

• Find all files with Hotkeys (Shortcut Keys):

  $sh = New-Object -ComObject WScript.Shell
  ls -Path `
      $Env:USERPROFILE\Desktop,
      $Env:PUBLIC\Desktop,
      $Env:APPDATA\Microsoft\Windows\"Start Menu",
      $Env:ALLUSERSPROFILE\Microsoft\Windows\"Start Menu",
      $Env:APPDATA\Microsoft\"Internet Explorer"\"Quick Launch" `
      -Recurse -Force -Include *.lnk,*.url,*.pif |
      Foreach-Object {
          $link = $sh.CreateShortcut($_.FullName);
          if ( $link.Hotkey ) { echo $link }
      }

  Source: SuperUser Question

List Files

• List Files Recursively:

  Get-ChildItem -Recurse -File -Path 'C:\Your\Folder' | select -ExpandProperty FullName
  dir -Recurse *.txt | select FullName

• List Files by Modified Date:

  dir | sort LastWriteTime

File Checksum

• Validate File with Checksum:

  (Get-FileHash -Algorithm SHA512 filename).Hash -eq "checksum-value"
  (Get-FileHash -Algorithm SHA512 .\dotnet-sdk-11.0.100-preview.2.26159.112-win-x64.exe).Hash -eq "6811b9e4d225d1de5f200a950cd663966b1d809bf171f458a02087d58fa9a95ae61fa3022a8f21cdd4769867f53d2ff4b47bae8c6edd16b403d230d413f7a3cb"

PSModulePath

• [Environment]::GetEnvironmentVariable("PSModulePath", "User"):
  • $env:UserProfile\Documents\PowerShell\Modules
• [Environment]::GetEnvironmentVariable("PSModulePath", "Machine"):
  • C:\Program Files\WindowsPowerShell\Modules
  • C:\WINDOWS\system32\WindowsPowerShell\v1.0\Modules
  • C:\Program Files (x86)\Microsoft SQL Server\110\Tools\PowerShell\Modules\