如果<condition>表达式为 true,则执行<if-true>表达式 如果<condition>表达式为 false,则执行<if-false>表达式 例如: PowerShell $message= (Test-Path$path) ?"Path exists":"Path not found" 在此示例中,当 返回 时,$message的值为Path exists。Test-Path$true$false返回 时Test-Path,的$messagePath not ...
问在Powershell中检查环境变量值EN之前连续写了几篇 Shell Operator 的东西，后来又写了一篇 cosign 的...
You can create and update the value of environment variables with the following syntax: PowerShell $Env:<variable-name> ="<new-value>" For example, to create theFooenvironment variable: PowerShell $Env:Foo='An example' Because environment variables are always strings, you can use them like ...
脚本可以包含任何有效的 PowerShell 命令,包括单个命令、使用管道的命令、函数和控制结构(如 If 语句和 For 循环)。 若要编写脚本,请在文本编辑器中打开一个新文件,键入命令,并将其保存在具有文件扩展名的有效文件名的.ps1文件中。 以下示例是一个简单的脚本,用于获取当前系统上运行的服务并将其保存到日志文件。
[Remove];$deleteOp="remove"# Test if the file existsif(!(Test-Path$filePath)){Write-Warning"File not found: $filePath"return}# Test if action is validif(!($action.ToLower()-in@($newOp,$deleteOp))){Write-Warning"Action must be 'new' or 'delete'"return$false}# Open the file ...
If PowerShell can’t find an environment variable named TestVariable it will automatically create the variable and assign it the specified value. If it turns out that an environment variable named TestVariable already exists then PowerShell will simply assign the new value to the existing variable...
借助PowerShell,可通过将赋值括在括号 () 内,在表达式中使用赋值。 PowerShell 会传递分配的值。 例如:PowerShell 复制 # In an `if` conditional if ($foo = Get-Item $PROFILE) { "$foo exists" } # Property access ($profileFile = Get-Item $PROFILE).LastWriteTime # You can even *assign* ...
It is singleton object, meaning there is only one instance of $null in PowerShell environment. 3. Using the Equality Operator -eq The eq operator is the most straightforward and recommended method to check if a variable is null. Use Conditional Statement 1 2 3 4 5 6 7 8 9 $my...
just because you were able to find the profile doesn’t mean it actually exists. $profile is simply a built-in variable that contains the full path to where the profile will be if there is one; the file doesn’t actually have to exist, and, by default. it doesn’t. If you want a...
If you’re using PowerShell Core on different operating systems, you’ll discover that the environment variable for finding the temporary directory is different on Windows, macOS, and Linux! With this feature, you will get aPSDrivecalledTemp:that is automatically mapped to the temporary folder on...