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Is & ldquo; Dollar-sign & rdquo; Optional in powershell & ldquo; $ (...

 3 years ago
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Is & ldquo; Dollar-sign & rdquo; Optional in powershell & ldquo; $ () & Rdquo;

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I've seen an example for setting the timestamps (creationtime, lastaccesstime, lastwritetime) of a file with powershell:

PS>$(get-item test.txt).lastwritetime=$(get-date "01/01/2020")

which seems to work.

This page: http://ss64.com/ps/syntax-operators.html about powershell operators says that "$( )" is a "SubExpression operator".

But it also seems to work without the "$" like:

PS>(get-item test.txt).lastwritetime=(get-date "01/01/2020")

and most powershell examples I've seen omit the "$" when using parenthesis.

So, is the "Dollar-sign" optional in powershell "$()" ? Or is there some difference with/without the "$" that I'm just not seeing.

Is "$()" and "()" actually 2 different operators that just happen to both be valid uses in the examples I have shown?

You need the $ sign to denote a sub expression if you use multiple statements or the statement is embedded in a string. Parenthesis without the $ is just a grouping operator.

$($x = 1; $y =2; $x + $y).tostring() //3

($x = 1; $y =2; $x + $y).tostring() // invalid syntax

($x = 1 + 2).tostring() //3

"$(1 +2)"  //3
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