Using $$, $^, $?

As requested by some of the attendees of my user group, here are some example on how to use $$, $^, $?

$$

Contains the last token in the last line received by the current session.

Get-ChildItem -path "c:\windows\" -filter "*.log"

$$

Returns: *.log

$^

Contains the first token in the last line received by the session.

Get-ChildItem -path "c:\windows\" -filter "*.log"

$^

Returns: Get-ChildItem

$?

Contains the execution status of the last operation. It contains TRUE if the last operation succeeded and FALSE if it failed.

Get-ChildItem -path "c:\windows\" -filter "*.log"

$?

Returns: True