PS> $null -eq $undefinedVariable True 如果您碰巧誤寫變數名稱,則 PowerShell 會將它視為不同的變數,且值為 $null。您找到$null值的另一種方式是從不提供任何結果的其他命令中獲得這些值。PowerShell 複製 PS> function Get-Nothing {} PS> $value = Get-Nothing PS> $null -eq $value True $...
示例Get-Proc cmdlet 将输入验证属性(System.Management.Automation.ValidateNotNullOrEmptyAttribute)添加到 Name 参数,以启用输入既不是 null 也不是空的验证。 此属性是 Windows PowerShell 提供的多个验证属性之一。 有关其他验证属性的示例,请参阅 验证参数输入。 复制 [Parameter(Position = 0)] ...
Functions create a new scope. The items created in a function, such as variables, exist only in the function scope. For more information, seeabout_Scopes. Find and manage functions using theFunction:drive All the functions and filters in PowerShell are automatically stored in theFunction:drive....
Before we decide to create a profile, let’s check to see whether we already have one: Test-Path $profile If the profile exists this command will return True; if it doesn’t exist, the command will return False. If this command returns False, you need to create the profile. Creating a...
Create(RunspaceMode) Constructs an empty PowerShell instance; a script or command must be added before invoking this instance. CreateNestedPowerShell() Creates a nested powershell within the current instance. Nested PowerShell is used to do simple operations like checking state of a variable whi...
Delete empty folders Delete everything within a specific directory Delete files older than 24 hours Delete files older than and create a log of which files were deleted Delete files on remote server Delete files/folders on remote servers using powershell Delete folder based on date of creation of...
# Create a cmdlet that accepts a [datetime] argument. Add-Type @' using System; using System.Management.Automation; [Cmdlet("Get", "Date_Cmdlet")] public class GetFooCmdlet : Cmdlet { [Parameter(Position=0)] public DateTime Date { get; set; } protected override void ProcessR...
Again, if TestVariable does not exist PowerShell will create the new environment variable for us. If TestVariabledoesexist, then PowerShell will assign it the valueTest value. One thing to watch out for: when we used SetEnvironmentVariable to create a new user- or machine-level environment ...
These commands create a new credential object (for the CachedUser user) and store that object in the $credential variable. When reading the solution, you might at first be wary of storing a password on disk. While it is natural (and prudent) to be cautious of littering your hard drive wi...
Make sure the vPack pipeline does not produce an empty package (#24988)Documentation and Help ContentAdd 7.4.9 changelog (#25169) Create changelog for 7.4.8 (#25089)SHA256 Hashes of the release artifactshashes.sha256 0862EF2D140E21B81BE3D6CC138F6489745AC3C9B148D7204F88F0F24EE12E41 ...