4. Operatoren

Variablen werden häufig mit Hilfe von Operatoren weiterverarbeitet. Die gängigsten Operatoren sind die mathematischen Operatoren wie Addition, Multiplikation, Division,etc. Im Anhang finden Sie eine Übersicht Mathematische Operatoren.

4.1. Powershell-Variablen

Variable	Bedeutung
$^	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 the last statement
$Args	Used in creating functions requiring parameters
$Error	If an error occurred, the error object is saved in the $error variable.
$ExecutionContext	The execution objects available to cmdlets
$foreach	Refers to the enumerator in a foreach loop
$HOME	The user’s home directory; set to %HOMEDRIVE%%HOMEPATH%
$Input	Input is piped to a function or code block.
$Match	A hash table consisting of items found by the -match operator
$MyInvocation	Information about the currently executing script or command-line
$PSHome	The directory where PS is installed
$Host	Information about the currently executing host
$LastExitCode	The exit code of the last native application to run
$true	Boolean TRUE
$false	Boolean FALSE
$null	A null object
$this	In the Types.ps1xml file and some script block instances, this represents the current object
$OFS	Output Field Separator used when converting an array to a string
$ShellID	The identifier for the shell. This value is used by the shell to determine the ExecutionPolicy and what profiles are run at Startup
$StackTrace	Contains detailed stack trace information about the last error

4.2. Vergleichsoperatoren

Operator	klassisch	Beschreibung	Beispiel	Ergebnis
-eq,-ceq, -ieq	=	Gleichheit	10 -eq 15	$true
-ne, -cne, -ice	<>	Ungleichheit	10 -ne 15	$true
-gt,-cgt, -igt	>	Größer	10 -gt 15	$false
-ge,-cge, -ige	>=	Größer gleich	10 -ge 15	$false
-lt,-clt, -ilt	<	Kleiner	10 -lt 15	$true
-le,-cle, -ile	<=	Kleiner gleich	10 -le 15	$true
-contains [#]_		Enthält	1,2,3 -contains 1	$true
-notcontains		Nicht enthält	1,2,3 -notcontains 1	$false
-is		Typgleichheit	$feld -is [array]	$true
-like		Wildcard
-notlike		Wildcard
-match		regulärer Ausdruck
-notmatch		regulärer Ausdruck

4.3. Logische Operatoren

4.4. Mathematische Operatoren

Es gelten folgende Voraussetzungen

PS> $a = 10
    $b = 15

Operator	klassisch	Beispiel	Ergebnis
Addition	+	$a + $b	25
Division	-	$a - $b	-5
Multiplikation	*	$a * $b	$false
Modulo [#]_	%	$a % 3	1
Increment	++	$a++	11
Decrement	- -	$b- -	14