如何编写以托管来自 Powershell 中每个循环的唯一结果列表?

Question

在下面的代码中，我得到了一个重复值的列表。我试图为每个重复的行只有一行，不同的。

这是代码：

# Find DC list from Active Directory
$DCs = Get-ADDomainController -Filter *
# Define time for report (default is 1 day)
$startDate = (get-date).AddDays(-1)
# Store successful logon events from security logs with the specified dates and workstation/IP in an array
foreach ($DC in $DCs){
$slogonevents = Get-Eventlog -LogName Security -ComputerName $DC.HostName  -after $startDate -InstanceId 4624 | where {$_.ReplacementStrings[5].ToLower() -eq "administrator"}
# Crawl through events; print all logon history with type, date/time, status, account name, computer and IP address if user logged on remotely
foreach ($e in $slogonevents){            
if ($e.EventID -eq 4624 -and $e.ReplacementStrings[8] -In 3..10){            
if([ipaddress]::TryParse($e.ReplacementStrings[18],[ref][ipaddress]::Loopback))
{
$type = $e.ReplacementStrings[8]
$ip = $e.ReplacementStrings[18]
$hostname=([system.net.dns]::GetHostByAddress($ip)).HostName
write-host "Type:" $type "`tIP Address: " $ip  "`tHost Name: " $hostname             
}
}
}
} Get-Unique #this does not work, also tried Unique

我得到的输出类似于以下内容">

Type: 3  IP Address: 192.168.1.1 Host Name: ABCD
Type: 3  IP Address: 192.168.1.1 Host Name: ABCD
Type: 3  IP Address: 192.168.1.1 Host Name: ABCD
Type: 3  IP Address: 192.168.1.2 Host Name: EFGH
Type: 3  IP Address: 192.168.1.2 Host Name: EFGH
Type: 3  IP Address: 192.168.1.2 Host Name: EFGH
Type: 3  IP Address: 192.168.1.1 Host Name: ABCD

我想得到：

Type: 3  IP Address: 192.168.1.1 Host Name: ABCD
Type: 3  IP Address: 192.168.1.2 Host Name: EFGH

Answer 1

我认为您没有获得唯一值的原因是您在Unique之前正在编写foreach循环中的主机。基本上是在它知道什么是unique之前把它们写出来

我要做的是创建一个PSCustomObject并将其分配到您的foreach中。这将允许您稍后使用| Select -Unique调用它

# Find DC list from Active Directory
$DCs = Get-ADDomainController -Filter *
# Define time for report (default is 1 day)
$startDate = (get-date).AddDays(-1)
# Store successful logon events from security logs with the specified dates and workstation/IP in an array
foreach ($DC in $DCs){
$slogonevents = Get-Eventlog -LogName Security  -after $startDate -InstanceId 4624 | where {$_.ReplacementStrings[5].ToLower() -eq "administrator"}
# Crawl through events; print all logon history with type, date/time, status, account name, computer and IP address if user logged on remotely
foreach ($e in $slogonevents){  
$report = @() 
if ($e.EventID -eq 4624 -and $e.ReplacementStrings[8] -In 3..10){            
if([ipaddress]::TryParse($e.ReplacementStrings[18],[ref][ipaddress]::Loopback))
{
$object = New-Object PSCustomObject -Property @{
type = $e.ReplacementStrings[8]
ip = $e.ReplacementStrings[18]
hostname=([system.net.dns]::GetHostByAddress($($e.ReplacementStrings[18]))).HostName        
}
$report += $object
}
}
}
}
$report | select -Unique