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I've seen a number of example scripts online that use this. Most recently, I saw it in a script on automating TFS:
[string] $fields = "Title=$($taskTitle);Description=$($taskTitle);Assigned To=$($assignee);" $fields += "Area Path=$($areaPath);Iteration Path=$($iterationPath);Discipline=$($taskDisciplineArray[$i]);Priority=$($i+1);" $fields += "Estimate=$($taskEstimateArray[$i]);Remaining Work=$($taskRemainingArray[$i]);Completed Work=$($tasktaskCompletedArray[$i])" From what I can tell, $($taskTitle) seems to be equivalent to $taskTitle. Am I missing something? Is there any reason to use the parentheses and extra dollar sign?
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$_ is an alias for automatic variable $PSItem (introduced in PowerShell V3. 0; Usage information found here) which represents the current item from the pipe.
The $() is the subexpression operator. It causes the contained expressions to be evaluated and it returns all expressions as an array (if there is more than one) or as a scalar (single value).
In PowerShell V2, @ is also the Splat operator. PS> # First use it to create a hashtable of parameters: PS> $params = @{path = "c:\temp"; Recurse= $true} PS> # Then use it to SPLAT the parameters - which is to say to expand a hash table PS> # into a set of command line parameters.
A variable is a unit of memory in which values are stored. In PowerShell, variables are represented by text strings that begin with a dollar sign ( $ ), such as $a , $process , or $my_var .
The syntax helps with evaluating the expression inside it.
$arr = @(1,2,3) $msg1 = "$arr.length" echo $msg1 # prints 1 2 3.length - .length was treated as part of the string $msg2 = "$($arr.length)" echo $msg2 # prints 3 You can read more at http://ss64.com/ps/syntax-operators.html
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