{"id":1580,"date":"2011-08-03T11:22:36","date_gmt":"2011-08-03T15:22:36","guid":{"rendered":"http:\/\/jdhitsolutions.com\/blog\/?p=1580"},"modified":"2011-08-03T11:22:36","modified_gmt":"2011-08-03T15:22:36","slug":"filtering-empty-values-in-powershell","status":"publish","type":"post","link":"https:\/\/jdhitsolutions.com\/blog\/powershell\/1580\/filtering-empty-values-in-powershell\/","title":{"rendered":"Filtering Empty Values in PowerShell"},"content":{"rendered":"

I saw this tip <\/a>today and wanted to leave a comment but couldn't see how. So I thought I'd post my comments here. This is actually a question I see often and there are better ways to write this kind of code.<\/p>\n

The posted tip used an example where you wanted to find processes where the company name is defined. The way suggested in the tip, and a technique I see often goes something like this:<\/p>\n

[cc lang=\"PowerShell\"]
\nPS C:\\> get-process | where {$_.Company -ne $Null} | Sort Company| Select Name,ID,Company
\n[\/cc]<\/p>\n

While it mostly works, this is a better PowerShell approach, in my opinion.<\/p>\n

[cc lang=\"PowerShell\"]
\nPS C:\\> get-process | where {$_.Company} | Sort Company| Select Name,ID,Company\"
\n[\/cc]<\/p>\n

When I run the first technique, I still got a blank company name. The tip offers a work around for this situation like this:<\/p>\n

[cc lang=\"PowerShell\"]
\nPS C:\\> get-process | where {$_.Company -ne $Null -AND $_.company -ne ''} | Sort Company| Select Name,ID,Company
\n[\/cc]<\/p>\n

This gives the same result as my suggested approach. My approach uses Where-Object to say, if the Company property exists, pass on the object. If you wanted to find processes without a company name, then use the -NOT operator.<\/p>\n

[cc lang=\"PowerShell\"]
\nPS C:\\> get-process | where {-Not $_.Company}
\n[\/cc]<\/p>\n

I use a similar technique to filter out blank lines in text files.<\/p>\n

[cc lang=\"PowerShell\"]
\nget-content computers.txt | where {$_} ...
\n[\/cc]<\/p>\n

While we're on the subject, a related filtering technique I often see involves boolean properties. You don't have to do this:<\/p>\n

[cc lang=\"PowerShell\"]
\nPS C:\\> dir | where {$_.PsIsContainer -eq $True}
\n[\/cc]<\/p>\n

PsIsContainer is a boolean value, so let Where-Object simply evaluate it:<\/p>\n

[cc lang=\"PowerShell\"]
\nPS C:\\> dir | where {$_.PsIsContainer}
\n[\/cc]<\/p>\n

As above, use -Not to get the inverse. Don't feel you need to explicitly evaluate properties in a Where-Object expression. I see this is a VBScript transition symptom that I hope you can break.<\/p>\n","protected":false},"excerpt":{"rendered":"

I saw this tip today and wanted to leave a comment but couldn’t see how. So I thought I’d post my comments here. This is actually a question I see often and there are better ways to write this kind of code. The posted tip used an example where you wanted to find processes where…<\/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":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[60,4,8],"tags":[309,534,540,301],"class_list":["post-1580","post","type-post","status-publish","format-standard","hentry","category-best-practices","category-powershell","category-scripting","tag-filtering","tag-powershell","tag-scripting","tag-where-object"],"yoast_head":"\nFiltering Empty Values in PowerShell • 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\/1580\/filtering-empty-values-in-powershell\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Filtering Empty Values in PowerShell • The Lonely Administrator\" \/>\n<meta property=\"og:description\" content=\"I saw this tip today and wanted to leave a comment but couldn't see how. 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