Powershell Cheat Sheet

  • $_ - Current PowerShell object
  • % - ForEach-Object
  • & "SomeString (or var)" - Execute what is in the string or var, e.g. 
     $MsBuild = "Path//To//MsBuild"
 & $MsBuild My.csproj /p:SomeOptions
  • $var = Read-Host "Prompt" - Get Input
  • > - Redirect operator 
     Some-Command > out.txt # redirect output of Some-Command to file
 2>&1 # redirect error to success stream
  • $null - Null
  • $true/$false - Boolean
  • -eq, -ne, -gt, -lt, -le, -ge - comparison operators Case-insensitive by default.
  • -and, -or, -xor, -not, ! - logical operators
  • -in, -notin, -contains, -notcontains - containment
  • $( ) - subexpression - evaluate the contents of the brackets
  • 1..5 - range operator
  • Get-Childitem -Path Env:* | Sort-Object Name - list out env vars
  • . some\script.ps1 - execute the contents of the script (the script path could contain variables)
  • $PSScriptRoot - the folder of the currently executing script
  • $MyInvocation - get the command that caused this invocation
    • $MyInvocation.PSCommandPath - the full path to the command for the current invocation
    • $MyInvocation.Line - gets the full text that caused the invocation
    • $MyInvocation.InvocationName - gets the command name to invoke the script. If executing as a script would be the script name
    • If($MyInvocation.Line.Length -gt $MyInvocationName.Length){
$params = $MyInvocation.Line.Substring($MyInvocation.InvocationName.Length)
}

      - get the full text after the script name if invoking script from command line

  • | Tee-Object - splits out the pipeline so you can “tap” the pipeline to pull out a variable or file and continue processing If it is the last part of the pipeline it will output to console.
    • | Tee-Object -Variable SomeVar - will split out the pipeline to $SomeVar.
[ powershell  ]