if($value-is[string] ) {# do something} 如果您正在處理類別或接受管線上的各種物件,您可以使用這。 您可以將服務或服務名稱作為輸入。 然後檢查您是否有服務,如果您只有名稱,則取得該服務。 PowerShell if($Service-isnot[System.ServiceProcess.ServiceController] ) {
if语句最常见的用法是比较两个项。 PowerShell 具有特殊运算符,可用于不同的比较方案。 当使用比较运算符时,会将左右两侧的值进行比较。 -eq(等于) -eq在两个值之间执行相等检查,以确保它们彼此相等。 PowerShell $value=Get-MysteryValueif(5-eq$value) {# do something} ...
switch [-regex | -wildcard | -exact] [-casesensitive] -file filename { "string" | number | variable | { <value-scriptblock> } { <action-scriptblock> } default { <action-scriptblock> } # optional } If no parameters are used, switch behaves the same as using the Exact parameter. ...
) in each file. A backslash (\) is used as an escape character and is necessary because the question mark (?) is a regular expression quantifier.Select-Stringdisplays the output in the PowerShell console. The file name and line number precede each line of content that contains a match ...
If you typeGet-SmallFileswithout a value, the function assigns 100 to$size. If you provide a value, the function uses that value. Optionally, you can provide a brief help string that describes the default value of your parameter, by adding thePSDefaultValueattribute to the description of your...
You can execute a script using its filename. A script file must have a.ps1file extension to be executable. Files that have spaces in their path must be enclosed in quotes. If you try to execute the quoted path, PowerShell displays the contents of the quoted string instead of running the...
事实证明在操作上重定向和Out-File非常的类似:当PowerShell转换管道结果时,文件的内容就像它在控制台上面输出的一样。Set-Content稍微有所不同。它在文件中只列出目录中文件的名称列表,因为在你使用Set-Content时,PowerShell不会自动将对象转换成文本输入。相反,Set-Content会从对象中抽出一个标准属性。上面的情况下,...
A script is a plain text file that contains one or more PowerShell commands. PowerShell scripts have a.ps1file extension. Running a script is a lot like running a cmdlet. You type the path and file name of the script and use parameters to submit data and set options. You can run scri...
Select-String C:\Scripts\test.txt -pattern "failed" Ah, but what if you want all the lines in the text file thatdon’tinclude the wordFailed? In Windows PowerShell 1.0, there’s no easy way to get that information. In Windows PowerShell 2.0, however, thereisa very easy way to get ...
If $Path contains input such as “; Write-Host Pwnd”, the attacker can now execute the Write-Host cmdlet (or much worse!) as well. The Invoke-Expression cmdlet should almost always be avoided, as PowerShell (like other languages) has many features that take its place more securely....