What is `$?` in Powershell?

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It returns true if the last command was successful, else false.

However, there are a number of caveats and non-obvious behaviour (e.g. what exactly is meant by “success”). I strongly recommend reading this article for a fuller treatment.

For example, consider calling Get-ChildItem. 

PS> Get-ChildItem 

PS> $? 
    True

$? will return True as the call to Get-ChildItem succeeded.

However, if you call Get-ChildItem on a directory which does not exist it will return an error.

PS> Get-ChildItem \Some\Directory\Which\Does\Not\Exist
    Get-ChildItem : Cannot find path 'C:\Some\Directory\Which\Does\Not\Exist' because it does not exist.

PS> $?
    False

$? will return False here, as the previous command was not successful.

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