September 2024
Intermediate to advanced
1002 pages
23h 43m
German
Content preview from PowerShell Kochbuch, 4. Auflage
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Kapitel 16. Umweltbewusstheit
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16.0 Einleitung
Auch wenn viele deiner Skripte so konzipiert sind, dass sie isoliert arbeiten, wirst du es oft hilfreich finden, deinem Skript Informationen über seine Ausführungsumgebung zu geben: seinen Namen, das aktuelle Arbeitsverzeichnis, Umgebungsvariablen, allgemeine Systempfade und mehr.
Die PowerShell bietet verschiedene Möglichkeiten, an diese Informationen zu gelangen - von den Cmdlets und den integrierten Variablen bis hin zu den Funktionen, die das .NET Framework bietet.
16.1 Anzeigen und Ändern von Umgebungsvariablen
Problem
Du möchtest mit den Umgebungsvariablen deines Systems interagieren.
Lösung
Um mit Umgebungsvariablen zu interagieren, greifst du auf sie fast genauso zu wie auf normale PowerShell-Variablen. Der einzige Unterschied ist, dass du env: zwischen das Dollarzeichen ($) und den Variablennamen setzt:
PS > $env:Username Lee
Du kannst auch Umgebungsvariablen auf diese Weise ändern. Zum Beispiel, um das aktuelle Verzeichnis vorübergehend zum Pfad hinzuzufügen:
PS > Invoke-DemonstrationScript Invoke-DemonstrationScript.ps1: The term 'Invoke-DemonstrationScript.ps1' is not recognized as a name of a cmdlet, function, script file, or executable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again. Suggestion [3,General]: The command ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.