3 min read
Typed PowerShell Arrays and Generic Lists
Understanding the different array types in PowerShell is essential for efficient data management and automation in your...
Unlocking the Power of PowerShell: Tips for Success
Discover PowerShell's hidden configuration variables! In tip #13, we delve into $ofs and $FormatEnumerationLimit –two under-the-radar settings that impact array formatting and output display. Learn how to use them to enhance readability and prevent cutoffs in console displays. Unlock the full potential of your PowerShell outputs!
There are two important configuration variables in PowerShell that have great impact on formatting, yet aren’t always seen.
$ofs (output field separator) contains one space by default. It is the character(s) that PowerShell uses when automatically turning arrays into strings:
PS C:\> $lottery = 1..49 | Get-Random -Count 7
PS C:\> "Lottery Numbers: $lottery"
Lottery Numbers: 22 2 48 44 23 13 4
PS C:\> $ofs = ', '
PS C:\> "Lottery Numbers: $lottery"
Lottery Numbers: 22, 2, 48, 44, 23, 13, 4
PS C:\> $ofs = ','
PS C:\> "Lottery Numbers: $lottery"
Lottery Numbers: 22,2,48,44,23,13,4
$FormatEnumerationLimit defaults to 4. This is the number of array elements that PowerShell includes in any string conversion preview. Here is an example:
Get-Service |
Where-Object { $_.DependentServices.Count -gt 1 } |
Select-Object -Property Name, Dep*
You get a list with services that have at least 2 dependent services. When you look closely at the results, you see that a maximum of 4 dependent services are visible. If a service has more, the list is cut off, and "…" is shown:
NlaSvc {NcdAutoSetup, AppVClient, netprofm}
nsi {WlanSvc, icssvc, Wcmsvc, upnphost...}
p2pimsvc {PNRPAutoReg, p2psvc, PNRPsvc}
PNRPsvc {PNRPAutoReg, p2psvc}
ProfSvc {XblGameSave, TokenBroker, UserManager, shpamsvc...}
SamSs {MSDTC, KAPSService, LanmanServer, KtmRm}
When you set $FormatEnumerationLimit to any other number, you can control this limit. Setting it to -1 disables any limit and always shows all elements:
Now all entries are visible:
NlaSvc {NcdAutoSetup, AppVClient, netprofm}
nsi {WlanSvc, icssvc, Wcmsvc, upnphost, SSDPSRV, NcdAutoSetup, AppVClient, netprofm, NlaSvc, KND...
p2pimsvc {PNRPAutoReg, p2psvc, PNRPsvc}
PNRPsvc {PNRPAutoReg, p2psvc}
ProfSvc {XblGameSave, TokenBroker, UserManager, shpamsvc, NaturalAuthentication, Appinfo}
SamSs {MSDTC, KAPSService, LanmanServer, KtmRm}
Except, with "nsi" in this example, there is still a "…" and cut-off. This time, however, it was triggered by the console space constraints. To overcome these as well, you’d need to add Format-Table:
Get-Service |
Where-Object { $_.DependentServices.Count -gt 1 } |
Select-Object -Property Name, Dep* |
Format-Table -Wrap -AutoSize
Now the output finally lists all output without cutting off anything:
NlaSvc {NcdAutoSetup, AppVClient, netprofm}
nsi {WlanSvc, icssvc, Wcmsvc, upnphost, SSDPSRV, NcdAutoSetup, AppVClient, netprofm, NlaSvc,
KNDBWM, KAPSService, Netman, NcaSvc, SessionEnv, Netlogon, LanmanWorkstation, Killer Network
Service, jhi_service, IpxlatCfgSvc, iphlpsvc, XboxNetApiSvc, IKEEXT, hns, Dnscache,
WinHttpAutoProxySvc, Dhcp}
p2pimsvc {PNRPAutoReg, p2psvc, PNRPsvc}
PNRPsvc {PNRPAutoReg, p2psvc}
ProfSvc {XblGameSave, TokenBroker, UserManager, shpamsvc, NaturalAuthentication, Appinfo}
SamSs {MSDTC, KAPSService, LanmanServer, KtmRm}
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Jan 28, 2025 by Aleksandar Nikolić and Dr. Tobias Weltner
Understanding the different array types in PowerShell is essential for efficient data management and automation in your...
Jan 21, 2025 by Aleksandar Nikolić and Dr. Tobias Weltner
Optimizing PowerShell arrays is key to improving script performance and ensuring efficient data handling in your...
Jan 16, 2025 by Aleksandar Nikolić and Dr. Tobias Weltner
Here is part two of our tips on PowerShell arrays.
Let’s explore some common caveats with arrays, starting with the...
Tobias Weltner and Aleksandar Nikolić joinly wrote the blog post series 'Tobias&Aleksandar's PowerShell tips'. So we introduce both of them here:
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Aleksandar Nikolić is a Microsoft Azure MVP and co-founder of PowerShellMagazine.com, the ultimate online source for PowerShell enthusiasts. With over 18 years of experience in system administration, he is a respected trainer and speaker who travels the globe to share his knowledge and skills on Azure, Entra, and PowerShell. He has spoken at IT events such as Microsoft Ignite, ESPC, NIC, CloudBrew, NTK, and PowerShell Conference Europe.
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Tobias is a long-time Microsoft MVP and has been involved with the development of PowerShell since its early days. He invented the PowerShell IDE "ISESteroids", has written numerous books on PowerShell for Microsoft Press and O'Reilly, founded the PowerShell Conference EU (psconf.eu), and is currently contributing to the advancement of PowerShell as member in the "Microsoft Cmdlet Working Group". Tobias shares his expertise as a consultant in projects and as a trainer in in-house trainings for numerous companies and agencies across Europe.