if($null-ne$path-and(Test-Path-Path$path) ) -或 -or可讓您指定兩個表達式,並在其中一個表達式$true時傳回$true。 PowerShell if($age-le13-or$age-ge55) 就像-and運算符一樣,評估會從左到右進行。 如果第一個部分是$true,那麼整個語句就是$true,並且不會處理表達式的其餘
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} ...
ValidateNotNullAttribute:限制变量不能为空 ValidateNotNullOrEmptyAttribute:限制变量不等为空,不能为空字符串,不能为空集合 ValidatePatternAttribute:限制变量要满足制定的正则表达式 ValidateRangeAttribute:限制变量的取值范围 ValidateSetAttribute:限制变量的取值集合 ValidateNotNullAttribute 例子 ValidateNotNullOrEmptyAtt...
If the function is invoked without pipeline input, PowerShell executes theprocessblock only once. Within a pipeline, theprocessblock executes once for each input object that reaches the function. If the pipeline input that reaches the function is empty, theprocessblock doesn't execute. ...
Provide an argument that is not null or empty, and then try the command again. CannotConnect,PSSessionStateBroken Cant access a fileshare through a remote PS Session Cant make work with variable in Get-ADuser command to get UPN Cant return string for msExchMailboxGUID Cant use dfsutil in ...
functionFind-LocalRoleCapability{$results= @()# Find modules with a "RoleCapabilities" subfolder and add any PSRC files to the result setGet-Module-ListAvailable|ForEach-Object{$psrcpath=Join-Path-Path$_.ModuleBase-ChildPath'RoleCapabilities'if(Test-Path$psrcpath) {$results+=Get-ChildItem-Pa...
Also, whenSimpleMatchis used, theMatchesproperty of theMatchInfoobject returned is empty. Note When this parameter is used with theAllMatchesparameter, theAllMatchesis ignored. Type:SwitchParameter Position:Named Default value:False Required:False ...
Test-NetConnection We feel like a kid in a candy store. Or at least a kid in a candy store that also sells PowerShell cmdlets. PowerTab And then there was: PowerTab. As you probably know, out of the box Windows PowerShell includes some basictab expansion. (OK, “out of the box”...
Again, if TestVariable does not exist PowerShell will create the new environment variable for us. If TestVariabledoesexist, then PowerShell will assign it the valueTest value. One thing to watch out for: when we used SetEnvironmentVariable to create a new user- or machine-level environment ...
This has significant implications for a function whose parameter has different meaning for$nullversus[string]::empty. In DSC resources, for example, it is natural to pass groups of parameters from the Set and Test functions down through a call stack which eventually makes a system call to manip...