为了管理变量,powershell提供了五个专门管理变量的命令Clear-Variable,Get-Variable,New-Variable,Remove-Variable,Set-Variable。因为虚拟驱动器variable:的存在,clear,remove,set打头的命令可以被代替。但是Get-Variable,New-Variable。却非常有用new-variable可以在
The call operator is another way to execute script blocks stored in a variable. Like Invoke-Command, the call operator executes the script block in a child scope. The call operator can make it easier for you to use parameters with your script blocks. PowerShell Copy $a ={ param($p1, ...
它會將檔案的內容匯入到scriptblock,然後檢查以確保其中沒有任何其他 PowerShell 命令,才執行它。 說到這裡,您知道模組指令清單(.psd1檔案)只是雜湊表嗎? 索引鍵可以是任何物件 大部分時候,鍵只是字串。 因此,我們可以把引號放在任何東西周圍,並讓它成為關鍵。
Get-Variable和Set-Variable语法比之前使用的赋值语法的功能更加的强大,二者均支持-scope参数,用来指定将会在哪个作用域范围内搜索和设置变量名。scope参数值为0代表当前作用域,1代表父作用域,2代表祖父作用域等。可以用这些参数来在当前脚本块中修改父作用域的变量值,下例重写$personAction: PS C:\> $name = "Li...
Saving the output in a variable We know that scripts executed withMeasure-Objectruns in the current scope. So we could assign the result to a variable, and work with it. Copy $range=1..100$evenCount=0$scriptBlock= {foreach($numberin$range) {if($number%2-eq0) {$evenCount++ ...
新创建的变量会在当前作用域中覆盖之前传递的参数,原参数值不变,为改变传递到函数中的参数值,可以使用Get-Variable和Set-Variable在复杂的作用域间更改变量值。下例创建的函数用来交换两个变量值:展开表 PS C:\> function SwapValue($first, $second) >> { >> $firstValue = Get-Variable $first -scope ...
When you use a function in a pipeline, the objects piped to the function are assigned to the$inputautomatic variable. The function runs statements with thebeginscript block before any objects come from the pipeline. The function runs statements with theendscript block when there are no more obje...
First named scriptblock argument is: One Second named scriptblock argument is: 4 通过此例来分析script 和function的关系。 Script由普通的Function以及其他的逻辑语句(顺序、选择、循环)组成。 对pipeline input进行处理的script语句。其结构为 param(…) ...
Without GetNewClosure, the script block ends up changing the value of the variable in the nearest scope, which happens to be in g():PS > function g { param($block) $a=234; &$block; "in g `$a is $a" } PS > function f { $a=123; g { $aa=[ref]$a; "The value of `$...
The following pattern shows how you can register PowerShell classes and enumerations as type accelerators in a module. Add the snippet to the root script module after any type definitions. Make sure the$ExportableTypesvariable contains each of the types you want to make available to users when ...