Use of Variables
When working with Windows PowerShell, the default is that you don't need to declare variables prior to use; the variable is declared when you use it to hold data. All variable names must be preceded with a dollar sign. There are a number of special variables in Windows PowerShell. These variables are created automatically and each has a special meaning. Table 2-2 lists the special variables and their associated meanings.
Table 2-2. Use of Special Variables
Name | Use |
|---|---|
$^ | Contains the first token of the last line input into the shell. |
$$ | Contains the last token of the last line input into the shell. |
$_ | The current pipeline object; used in script blocks, filters, Where-Object, ForEach-Object, and switch. |
$? | Contains the success/fail status of ... |
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