Example
Contains status of the last operation. When there is no error, it is set to True:
PS C:\> Write-Host "Hello"
Hello
PS C:\> $?
True
If there is some error, it is set to False:
PS C:\> wrt-host
wrt-host : The term 'wrt-host' is not recognized as the name of a cmdlet, function, script file, or operable program.
Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:1
+ wrt-host
+ ~~~~~~~~
+ CategoryInfo : ObjectNotFound: (wrt-host:String) [], CommandNotFoundException
+ FullyQualifiedErrorId : CommandNotFoundException
PS C:\> $?
False
