Variables powershell

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Variable Name	Description
$_	The current pipeline object; used in script blocks, filters, the process clause of functions, where-object, foreach-object and switch
$^	contains the first token of the last line input into the shell
$$	contains the last token of last line input into the shell
$?	Contains the success/fail status of the last statement
$Args	Used in creating functions that require parameters
$Env:Path	Environmental Path to files.
$Error	If an error occurred, the object is saved in the $error PowerShell variable
$foreach	Refers to the enumerator in a foreach loop.
$HOME	The user’s home directory; set to %HOMEDRIVE%%HOMEPATH%
$Input	Input piped to a function or code block
$Match	A hash table consisting of items found by the -match operator.
$MyInvocation	Information about the currently script or command-line
$Host	Information about the currently executing host
$LastExitCode	The exit code of the last native application to run
$true	Boolean TRUE
$false	Boolean FALSE
$null	A null object
$OFS	Output Field Separator, used when converting an array to a string. By default, this is set to the space character.
$ShellID	The identifier for the shell.  This value is used by the shell to determine the ExecutionPolicy and what profiles are run at startup.
$StackTrace	contains detailed stack trace information about the last error