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PowerShell is a task automation and configuration management program from Microsoft, consisting of a command-line shell and the associated scripting language.Initially a Windows component only, known as Windows PowerShell, it was made open-source and cross-platform on August 18, 2016, with the introduction of PowerShell Core. [9]
Microsoft Foundation Class Library (MFC) Active Template Library (ATL) Framework Class Library (FCL) Object Windows Library (OWL) Standard Template Library (STL) Visual Component Library (VCL) Windows Template Library (WTL) Windows UI Library (WinUI) Text Object Model (TOM)
Some programming languages—such as Ada and Windows PowerShell—allow subroutines to have named parameters. This allows the calling code to be more self-documenting. It also provides more flexibility to the caller, often allowing the order of the arguments to be changed, or for arguments to be omitted as needed. PowerShell example:
When the COM class factory tries to instantiate a class, the activation context is first checked to see if an implementation for the CLSID can be found. Only if the lookup fails, the registry is scanned. [16] A COM object can be created without type library information; with only a path to the DLL file and CLSID.
This can happen in multi-threaded environments, or even in single-threaded environments when other code (typically called in the destruction of some object) resets the global variable before the checking code. The following example shows a way to avoid this problem (see or ; cf. ). But at the cost of not being able to use return values:
In this view, scripting is glue code, connecting software components, and a language specialized for this purpose is a glue language. Pipelines and shell scripting are archetypal examples of glue languages, and Perl was initially developed to fill this same role.
A block is a grouping of code that is treated collectively. Many block syntaxes can consist of any number of items (statements, expressions or other units of code) – including one or zero. Languages delimit a block in a variety of ways – some via marking text and others by relative formatting such as levels of indentation.
Clicking on an icon or running from the command line, a script, the Run dialogue, etc. will by default run a plain text file containing the code. A Windows Script File (.wsf) is an XML file that can contain more than one script in more than one language in addition to other elements, and are executed by the Windows Script Host. [3]