about_Wildcards Compare-Object ForEach-Object Where-Object在GitHub 上与我们协作 可以在 GitHub 上找到此内容的源,还可以在其中创建和查看问题和拉取请求。 有关详细信息,请参阅参与者指南。 PowerShell 反馈 PowerShell 是一个开放源代码项目。 选择一个链接以提供反馈: 提出文档问题 提供产品反馈 中文...
另请参阅 about_Booleans about_Operators about_Regular_Expressions about_Wildcards Compare-Object ForEach-Object Where-Object在GitHub 上与我们协作 可以在 GitHub 上找到此内容的源,还可以在其中创建和查看问题和拉取请求。 有关详细信息,请参阅参与者指南。 PowerShell 反馈 PowerShell 是...
Compare two mailbox users directly in compare-object scriptblock compare two strings in if-then-else statement Compare two text files in Powershell and if a name is found in both files output content from file 2 to a 3rd text file Compare-Object : Cannot bind argument to parameter 'Referenc...
PowerShell is not strict on that. There are some classes that PowerShell does not consider enumerable such as strings, dictionaries, or hashtables. The reason for this is obvious after you think of it. Consider a string for
As you can see, we’re simply taking $a and calling theCompareTomethod, passing the second string ($b) as the sole method parameter. If CompareTo returns a 0, that means the two strings are equal; anything other than a 0 means that the two strings are different. (Technically, a -1...
Use comparison operators (-eq,-ne,-gt,-lt,-le,-ge) to compare values and test conditions. For example, you can compare two string values to determine whether they're equal. The comparison operators also include operators that find or replace patterns in text. The (-match,-notmatch,-repla...
Notice the second example doesn’t use a comparison operator such as -eq. That’s because the Test-Path cmdlet happens to return True or False to begin with. There’s no need to compare that to True or False in order for the expression to work. ...
If you work with database types, you may get back a[dbnull]::Valuewhich is equivalent to$nullwithin the database, but in PowerShell, this was not equal to$nullso you can’t compare it directly. This change fromJoel Sallowallows you to compare both[dbnull]::Valueand[nullstring]::Valu...
There’s no need to compare that to True or False in order for the expression to work. The parenthetical expression used with these scripting constructs merely needs to simplify down to True or False. If you’re using a command such as Test-Path, which always returns True or False, that...
{ $oldEntries = Import-CliXml $historyFile -ErrorAction SilentlyContinue } ## And merge them with our changes $currentEntries = Get-History -Count $maximumHistoryCount $additions = Compare-Object $oldEntries $currentEntries ` -Property CommandLine | Where-Object { $_.SideIndicator -eq "=>" ...