$env:中的环境变量只是电脑环境变量的一个副本,除了用.NET方法更新环境变量,其他的更改在下一次重新打开时,会恢复如初。 通过$env:提示powershell忽略基本的variable:驱动器,先去环境变量env:驱动器中寻找变量。 通过“ls env:”可以查询所有的环境变量,通过“$env:name”就可以访问指定name的环境变量了。 PS C:\...
$MyVariable = $null 若要刪除變數,請使用 Remove-Variable 或Remove-Item。 PowerShell 複製 Remove-Variable -Name MyVariable PowerShell 複製 Remove-Item -Path Variable:\MyVariable 您也可以使用一個語句,將值指派給多個變數。下列範例會將相同的值指派給多個變數: PowerShell 複製 $a = $b =...
$area=$length*$width$sum=$num1+$num2$path=$folder+$file 可以使用 Set-Variable cmdlet 设置变量的值。 使用此 cmdlet 时,在引用名称时不包括$符号,如以下示例所示: PowerShell Set-Variable-Namenum1-Value5 附加阅读材料:有关赋值运算符的详细信息,请参阅about_Assignment_Operators。
$a = 10, 20, 30 $a.Length # get instance property (10, 20, 30).Length $property = "Length" $a.$property # property name is a variable $h1 = @{ FirstName = "James"; LastName = "Anderson"; IDNum = 123 } $h1.FirstName # designates the key FirstName $h1.Keys # gets the...
TypeName: System.Object[] Name MemberType Definition --- --- --- Count AliasProperty Count = Length Address Method System.Object& Address(Int32 ) Clone Method System.Object Clone() ... 此结果可能不是预期的结果。 但了解后,可以使用它。 例如,所有数组对象都有计数属性。 可以使用该属性对计算...
To get the properties and methods of an array, such as the Length property and the SetValue method, use the InputObject parameter of the Get-Member cmdlet.When you pipe an array to Get-Member, PowerShell sends the items one at a time and Get-Member returns the type of each item in ...
Performing operation"Create File"on Target"Destination: C:\ps-test\test .txt". [Y] Yes [A] Yes to All [N] No [L] No to All [S] Suspend [?] Help (defau lt is"Y"): y Directory: C:\ps-testMode LastWriteTime Length Name --- --- --- ---a---8/27/20102:41PM0test.txt...
of each FileInfo# object you pass in. Use the pipeline variable to divide each file's length by# 1 KiloBytes$size= @{Label="Size(KB)";Expression={$_.Length/1KB}}# Create an additional calculated property with the number of Days since the# file was last accessed. You can also shorten...
Use the pipeline variable to divide each file's length by # 1 KiloBytes $size = @{Label="Size(KB)";Expression={$_.Length/1KB}} # Create an additional calculated property with the number of Days since the # file was last accessed. You can also shorten the key names to be 'l', ...
In addition to being useful for script control flow, conditional statements are often a useful way to assign data to a variable. PowerShell makes this very easy by letting you assign the results of a conditional statement directly to a variable: ...