PowerShell Predefined Variables
PowerShell Predefined Variables By Xah Lee. Date: 2009-07-30, 2012-03-31
PowerShell has several predefined variables, called automatic variables. Some of them are used for scripting, some give info about the environment. For example, $_ is a variable that contains the current argument (similar to Perl's “$_”), and is a most frequently used variable in scripting. The $Host is a variable that contains info about current PowerShell environment.
This page gives explanation and sample use, of the m...