{"id":4959,"date":"2016-03-01T12:18:16","date_gmt":"2016-03-01T17:18:16","guid":{"rendered":"http:\/\/jdhitsolutions.com\/blog\/?p=4959"},"modified":"2016-03-01T12:18:16","modified_gmt":"2016-03-01T17:18:16","slug":"the-power-of-custom-properties","status":"publish","type":"post","link":"https:\/\/jdhitsolutions.com\/blog\/powershell\/4959\/the-power-of-custom-properties\/","title":{"rendered":"The Power of Custom Properties"},"content":{"rendered":"

The other day fellow PowerShell MVP Adam Bertram published an article<\/a> about using custom properties with Select-Object<\/a>. It is a good article in that it gets you thinking about PowerShell in terms of objects and not simple text. But I want to take Adam's article as a jumping off point and take his ideas a bit further. I'm going to use Adam's same example as a learning tool. Don't get distracted by other ways to get the same information. The process and techniques are what matter here.<\/p>\n

Whenever I'm working with PowerShell, I'm always thinking about how I can use this at scale.\u00a0 How can I get this same information for 10 or 100 servers? And of course,\u00a0 at this point I need to make sure I include a computername in the results.\u00a0 First, I'll try something with a single computer.<\/p>\n

Get-CimInstance -ClassName Win32_PhysicalMemory -ComputerName chi-hvr1 |\r\nSelect PSComputername,@{Name = \"MemoryGB\";Expression = { ($_.Capacity | Measure -sum).sum\/1GB}}<\/pre>\n
\"image\"<\/a><\/p>\n
Close but not quite. Get-CimInstance<\/a> is writing multiple objects to the pipeline.\u00a0 The server in question has 2\u00a0 8GB sticks of memory which is what you see in the output. I need something more along Adam's original idea to that this becomes 16GB.<\/p>\n
What I really want is the Sum property from Measure-Object<\/a> and to that I need to add a Computername property. I'll turn things around a bit.<\/p>\n
Get-CimInstance -ClassName Win32_PhysicalMemory -ComputerName chi-hvr1 -PipelineVariable pv|\r\nMeasure-Object -Property capacity -Sum |\r\nSelect @{Name=\"Computername\";Expression={$pv.pscomputername}},\r\n@{Name=\"MemoryGB\";Expression = {$_.sum\/1GB}}<\/pre>\n
\"image\"<\/a><\/p>\n
This works because I'm using the common PipelineVariable parameter introduced in PowerShell 4.\u00a0 What happens is that the pipeline output from Get-CimInstance is stored in a variable, pv, which I can access later in the expression. In my case I'm defining a new property for the computername using $pv and adding it to the selected output from Measure-Object.<\/p>\n
However, if I try this for multiple computer names, I don't get the expected result.<\/p>\n
\"image\"<\/a><\/p>\n
That's because I'm adding up the physical memory instances from all servers, which isn't really what I want. Instead, this is a situation where I have to process each computer individually.<\/p>\n
$computers = \"chi-hvr1\",\"chi-hvr2\",\"chi-web02\",\"chi-win10\",\"chi-tp04\",\"win81-ent-01\"\r\nforeach ($computer in $computers) {\r\n    Get-CimInstance -ClassName Win32_PhysicalMemory -ComputerName $computer -PipelineVariable pv|\r\n    Measure-Object -Property capacity -Sum |\r\n    Select @{Name=\"Computername\";Expression={$pv.pscomputername}},\r\n    @{Name=\"MemoryGB\";Expression = {$_.sum\/1GB}}\r\n}<\/pre>\n
\"image\"<\/a><\/p>\n
One thing to be careful of when using the ForEach enumerator is that you can't pipe the output to another cmdlet like Export-CSV<\/a>, unless you explicitly save the results to a variable.<\/p>\n
$data = Foreach ($computer in $computers) { \u2026<\/pre>\n
Then you can pipe $data to other cmdlets. You can use ForEach-Object<\/a> although it might be little harder to follow.<\/p>\n
$computers | foreach {\r\nGet-CimInstance -ClassName Win32_PhysicalMemory -ComputerName $_ -PipelineVariable pv|\r\n    Measure-Object -Property capacity -Sum |\r\n    Select @{Name=\"Computername\";Expression={$pv.pscomputername}},\r\n    @{Name=\"MemoryGB\";Expression = {$_.sum\/1GB}}\r\n} | Sort MemoryGB,Computername<\/pre>\n
But this makes it easier if you need to pipe the output to something else.<\/p>\n
\"image\"<\/a><\/p>\n
To wrap this up let's go all out and define a few more custom properties.<\/p>\n
$computers | foreach {\r\nGet-CimInstance -ClassName Win32_PhysicalMemory -ComputerName $_ -PipelineVariable pv|\r\n    Measure-Object -Property capacity -Sum |\r\n    Select @{Name = \"Computername\";Expression={$pv.pscomputername}},\r\n    @{Name = \"Computer\";Expression = {\r\n     $cs = Get-CimInstance Win32_computersystem -ComputerName $pv.psComputername\r\n     #construct a string with manufacturer and model\r\n     \"$($cs.Manufacturer):$($cs.Model)\"\r\n    }},\r\n    @{Name = \"MemoryGB\";Expression = {$_.sum\/1GB}},\r\n    @{Name=\"NumberSticks\";Expression = {$_.Count}}\r\n} | Sort MemoryGB,Computername<\/pre>\n
\"image\"<\/a><\/p>\n
Even though I'm selecting a few properties from the output of Measure-Object, I'm defining several others which are calculated on the fly. There is so much you can do with this technique,\u00a0 but if I lost you anywhere please let me know.<\/p>\n","protected":false},"excerpt":{"rendered":"
The other day fellow PowerShell MVP Adam Bertram published an article about using custom properties with Select-Object. It is a good article in that it gets you thinking about PowerShell in terms of objects and not simple text. But I want to take Adam’s article as a jumping off point and take his ideas a…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"New from the blog: The Power of Custom Properties in #PowerShell","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[4,8,19],"tags":[514,534,540,302],"class_list":["post-4959","post","type-post","status-publish","format-standard","hentry","category-powershell","category-scripting","category-wmi","tag-pipelinevariable","tag-powershell","tag-scripting","tag-select-object"],"yoast_head":"\nThe Power of Custom Properties • The Lonely Administrator<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jdhitsolutions.com\/blog\/powershell\/4959\/the-power-of-custom-properties\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The Power of Custom Properties • The Lonely Administrator\" \/>\n<meta property=\"og:description\" content=\"The other day fellow PowerShell MVP Adam Bertram published an article about using custom properties with Select-Object. 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Specifically, he wanted to get the list of popular baby names from http:\/\/www.ssa.gov\/OACT\/babynames\/index.html. I gave him some quick tips but figured this would also be another teaching\u2026","rel":"","context":"In "Friday Fun"","block_context":{"text":"Friday Fun","link":"https:\/\/jdhitsolutions.com\/blog\/category\/friday-fun\/"},"img":{"alt_text":"baby","src":"https:\/\/i0.wp.com\/jdhitsolutions.com\/blog\/wp-content\/uploads\/2013\/06\/baby-150x150.png?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":6492,"url":"https:\/\/jdhitsolutions.com\/blog\/powershell\/6492\/creating-more-git-powershell-tools\/","url_meta":{"origin":4959,"position":5},"title":"Creating More Git PowerShell Tools","author":"Jeffery Hicks","date":"February 1, 2019","format":false,"excerpt":"I have received a tremendous amount of interest in my recent articles on creating a git sizing tool using PowerShell. 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