$^ and $$ | the first and last token that was received by a session. Apparently, the ^ and $ are modelled after their meaning in regular expressions (where they indicate the start or end of a line). |
$? | a boolean ($true or $false) that contains the status of the last operation. Compare with $lastExitCode which contains the exit code of the last native command or script that was run. |
$_ for which $PsItem is an alias | This automatic variable only makes sense inside a script block that is evaluated multiple times within a pipeline. |
$args | used for example for function parameters |
$consoleFileName | |
$error | |
$event, $eventArgs and $eventSubscriber | |
$executionContext | |
$input | set within the process and end block of functions within pipelines and refers to the objects as they're being processed from the function. |
$isCoreCLR | |
$isLinux, $isMacOS and $isWindows | |
$lastExitCode | |
$true and $false | constants for the two System.Boolean values. |
$foreach | |
$home | equivalent to $env:homeDrive$env:homePath and points to a user's home directory (for example C:\Users\username). |
$host | |
$matches | a collection that is populated when using regular expressions with the -match operator. |
$myInvocation | information about the current function, script or script block. This variable is especially useful to determine the name and location of a script within the script. |
$nestedPromptLevel | |
$null | |
$PID | The ID of the process hosting the current PowerShell session. |
$psBoundParameters | |
$profile | |
$psCmdlet | |
$psCulture | |
$psDebugContext | |
$psStyle | introduced in PowerShell 7.2 preview with the experimental feature PSAnsiRendering. |
$psHome | stores the path to the PowerShell installation directory (Usually C:\Windows\System32\WindowsPowerShell\v1.0 in non-Core PowerShell installations.). For example, predefined views are stored in this directory: ls $pshome -filter *.format.ps1xml |
$psEdition | indicates the used .NET runtime (PowerShell version 5.1 or higher). |
$psVersionTable | |
$PSModuleAutoLoadingPreference | controls the module autoloading behavior. Within a PowerShell script being executed, $psScriptRoot contains the absolute path of the directory where that script is located and $psCommandPath the absoulte path of the script itself. These variables evaluate to $null if they're not used within a script. |
$PsUICulture | |
$pwd | stores the current («present») working directory. |
$sender | corresponds to the object that generated an event. |
$ShellID | whose value might be Microsoft.PowerShell |
$SourceArgs | |
$SourceEventArgs | |
$switch | |
$this |