The automatic variables are those variables that store the state of the Windows PowerShell. These variables will contain the information of a user and the system, default variables, runtime variables, and PowerShell settings. These variables can be created and maintained by Windows PowerShell.
| Variable name |
Description |
| $$ |
This variable is used to represent the last token in the last line, which is received by the session. |
| $? |
This variable is used to represent the execution status of the last operation. If there is no error, it returns a True value otherwise False. |
| $^ |
This variable is used to represent the first token in the last line, which is received by the session. |
| $_ |
This variable acts as $PSItem. It contains the current object in the pipeline object. |
| $args |
This variable contains an array of values for undeclared parameters that are passed to a script, function, or script block. |
| $ConsoleFileName |
This variable is used to represent the path of the console file, which was recently used in the session. |
| $Error |
This variable is used to contain an array of error objects which represent the most recent errors. |
| $Event |
This variable is used to contain an object of PSEventArgs. PSEventArgs is an object used to represent an event that is being processed. |
| $EventSubscriber |
This variable is used to contain an object of PSEventSubscriber. This object shows you an event subscriber of an event that is being processed. |
| $EventArgs |
This variable is used to contain an object which represents the argument of the first event. |
| $false |
This variable is used to represent the False. |
| $foreach |
This variable is used to contain the enumerators of a ForEach loop. This variable exists only while the ForEach loop is executing. And it will be deleted after completion of the loop. |
| $Home |
This variable is used to represent the full path of the user's home directory. |
| $input |
This variable contains an enumerator that enumerates all the inputs passed to the function. It is only available to script blocks and functions. |
| $Host |
This variable contains an object which shows a current host application for the Windows PowerShell. |
| $IsLinux |
If the current session is running on the Linux operating system, this variable contains a $True, otherwise $False. |
| $IsWindows |
If the current session is running on the Windows operating system, this variable contains a $True, otherwise $False. |
| $IsMacOS |
If the current session is running on MacOS operating system, this variable contains a $True, otherwise $False. |
| $null |
This variable is used to represent a null or empty value. We can use it to represent an absent or undefined value in script and commands. |
| $PID |
This variable displays the PID of the process, which is hosting the session of the current PowerShell. |
| $PSItem |
This variable acts as $_. It contains the current object in the pipeline object. |
| $PSHome |
This variable represents the full path of the installation directory for the Windows PowerShell. |
| $PSVersionTable |
This variable is used to represent the read-only hash table, which displays the details about the version of PowerShell running in the current session. |
| $PWD |
This variable is used to contain the path object, which shows you a full path of the current directory. |
| $ShellId |
This variable is used to represent the identifier of the current shell. |
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