Get-EventLog always requires you to specify exactly one event log via -LogName. You cannot use wildcards, and you cannot browse all event logs at once.

However, here is a trick you can do:

 

PS> Get-EventLog -LogName *

  Max(K) Retain OverflowAction        Entries Log                                                         
  ------ ------ --------------        ------- ---                                                         
  20.480      0 OverwriteAsNeeded      13.283 Application
     512      7 OverwriteOlder             98 Dell       
  20.480      0 OverwriteAsNeeded           0 HardwareEvents
     512      7 OverwriteOlder              0 Internet Explorer                                           
     512      7 OverwriteOlder             46 isaAgentLog                                                 
  20.480      0 OverwriteAsNeeded           0 Key Management Service                                      
     128      0 OverwriteAsNeeded          97 OAlerts                                                     
  10.240      0 OverwriteAsNeeded           0 PowerShellPrivateLog                                        
     512      7 OverwriteOlder              0 PreEmptive                                                  
                                              Security                                                    
  20.480      0 OverwriteAsNeeded       5.237 System                                                      
  16.384      0 OverwriteAsNeeded          20 TechSmith                                                   
  15.360      0 OverwriteAsNeeded      10.279 Windows PowerShell
 

So apparently, -LogName does support wildcards after all. However, you now do not see the event log entries anymore, but rather a summary view. Still, you can get to the underlying event log entries like this:

 
PS> Get-EventLog -LogName * | Select-Object -ExpandProperty Entries -ErrorAction SilentlyContinue  
 

This dumps all event log entries from all logs. From here, you can add custom filters. To see all event log errors that occurred within the past 48 hours, try this:

# take events not older than 48 hours
$deadline = (Get-Date).AddHours(-48)

Get-EventLog -LogName * | 
  ForEach-Object {
    # get the entries, and quiet errors
    try { $_.Entries } catch {}
  } |
  Where-Object { 
    # take only errors
    $_.EntryType -eq 'Error'
  } |
  Where-Object {
    # take only entries younger than the deadline
    $_.TimeGenerated -gt $deadline
  }

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Anonymous