{"id":2752,"date":"2013-01-24T09:54:16","date_gmt":"2013-01-24T14:54:16","guid":{"rendered":"http:\/\/jdhitsolutions.com\/blog\/?p=2752"},"modified":"2013-01-24T09:54:16","modified_gmt":"2013-01-24T14:54:16","slug":"rename-hashtable-key-revised","status":"publish","type":"post","link":"https:\/\/jdhitsolutions.com\/blog\/powershell\/2752\/rename-hashtable-key-revised\/","title":{"rendered":"Rename Hashtable Key Revised"},"content":{"rendered":"

Last week I posted an advanced PowerShell function to rename a hashtable key<\/a>. As usual, the more I worked with it the more I realized it was missing something - namely the ability the take a pipelined object. My original version assumed you had saved the hashtable to a variable. But as I was working with ConvertTo-Hashtable<\/a> I realized the shortcoming. The solution was to modify Rename-Hashtable so that it could accept a hashtable as a piped value. <\/p>\n

I won't go through the function again. You can read the original post to learn more about how it works. Let's look at what changed. Because I wanted to retain the option to also specify a variable name, I created two parameters sets. One for the piped object and one for the variable name.<\/p>\n


\n[cmdletbinding(SupportsShouldProcess=$True,DefaultParameterSetName=\"Pipeline\")]<\/p>\n

Param(
\n[parameter(Position=0,Mandatory=$True,
\nHelpMessage=\"Enter the name of your hash table variable without the `$\",
\nParameterSetName=\"Name\")]
\n[ValidateNotNullorEmpty()]
\n[string]$Name,
\n[parameter(Position=0,Mandatory=$True,
\nValueFromPipeline=$True,ParameterSetName=\"Pipeline\")]
\n[ValidateNotNullorEmpty()]
\n[object]$InputObject,
\n[parameter(position=1,Mandatory=$True,
\nHelpMessage=\"Enter the existing key name you want to rename\")]
\n[ValidateNotNullorEmpty()]
\n[string]$Key,
\n[parameter(position=2,Mandatory=$True,
\nHelpMessage=\"Enter the NEW key name\")]
\n[ValidateNotNullorEmpty()]
\n[string]$NewKey,
\n[switch]$Passthru,
\n[ValidateSet(\"Global\",\"Local\",\"Script\",\"Private\",0,1,2,3)]
\n[ValidateNotNullOrEmpty()]
\n[string]$Scope=\"Global\"
\n)
\n<\/code><\/p>\n

I defined parameter sets called Pipeline and Name and made the former the default in the cmdletbinding attribute. Because the remaining parameters would be in both parameter sets I didn't specify one. When looking at the function's help you can see the result.<\/p>\n

\"rename-hashtable-paramsets\"<\/a><\/p>\n

Because I'm taking input from the pipeline, I needed to add a Process scriptblock. Within the scriptblock, if an object has been piped in, I turn on the passthru variable and create a temporary copy of the piped in hashtable.<\/p>\n


\nProcess {
\n #validate Key and NewKey are not the same
\n if ($key -eq $NewKey) {
\n Write-Warning \"The values you specified for -Key and -NewKey appear to be the same. Names are NOT case-sensitive\"
\n Return
\n }<\/p>\n

Try {
\n #validate variable is a hash table
\n if ($InputObject) {
\n $name=\"tmpInputHash\"
\n Set-Variable -Name $name -Scope $scope -value $InputObject
\n $Passthru=$True
\n }
\n...
\n<\/code><\/p>\n

The rest of the code worked just fine and there was no reason to change it. All I needed to do was transform the -Inputobject value into the -Name value since I already had code that used $Name. Sometimes you need separate code blocks but in this case I didn't. Once the transformation is complete, the rest of the function runs as originally designed. With this version I can now run commands like this:<\/p>\n


\nPS C:\\> $h = get-service spooler -computer Serenity | convertto-hashtable -NoEmpty -Exclude CanStop,CanPauseAndcontinue | rename-hashtable -key machinename -new computername
\nPS C:\\> $h<\/p>\n

Name Value
\n---- -----
\ncomputername Serenity
\nName spooler
\nServiceName spooler
\nRequiredServices {RPCSS, http}
\nDependentServices {Fax}
\nServiceType Win32OwnProcess, InteractiveProcess
\nStatus Running
\nServicesDependedOn {RPCSS, http}
\nServiceHandle SafeServiceHandle
\nDisplayName Print Spooler
\n<\/code><\/p>\n

Download Rename-Hashtable2<\/a> and give it a go.<\/p>\n","protected":false},"excerpt":{"rendered":"

Last week I posted an advanced PowerShell function to rename a hashtable key. As usual, the more I worked with it the more I realized it was missing something – namely the ability the take a pipelined object. My original version assumed you had saved the hashtable to a variable. But as I was working…<\/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":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[4],"tags":[199,307,98,534,540],"class_list":["post-2752","post","type-post","status-publish","format-standard","hentry","category-powershell","tag-hashtable","tag-parameter","tag-pipeline","tag-powershell","tag-scripting"],"yoast_head":"\nRename Hashtable Key Revised • 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\/2752\/rename-hashtable-key-revised\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Rename Hashtable Key Revised • The Lonely Administrator\" \/>\n<meta property=\"og:description\" content=\"Last week I posted an advanced PowerShell function to rename a hashtable key. 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Often generating hashtables on the fly from other sources. But sometimes the hashtable keys that come from these external sources don't align with what I intend to do with the hashtable. For example, one of the nifty things you can do with hashtables is\u2026","rel":"","context":"In "PowerShell"","block_context":{"text":"PowerShell","link":"https:\/\/jdhitsolutions.com\/blog\/category\/powershell\/"},"img":{"alt_text":"talkbubble","src":"https:\/\/i0.wp.com\/jdhitsolutions.com\/blog\/wp-content\/uploads\/2011\/10\/talkbubble-150x150.png?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":3073,"url":"https:\/\/jdhitsolutions.com\/blog\/friday-fun\/3073\/friday-fun-view-objects-in-a-powershell-gridlist\/","url_meta":{"origin":2752,"position":1},"title":"Friday Fun: View Objects in a PowerShell GridList","author":"Jeffery Hicks","date":"May 24, 2013","format":false,"excerpt":"One of the things that makes PowerShell easy to learn is discoverability. 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One question I received was \"Why?\" Well, one reason might be that you want to combine two objects into a single object. Joining them as two hashtables makes this an easier process. First off, combining two hashtables is\u2026","rel":"","context":"In "PowerShell"","block_context":{"text":"PowerShell","link":"https:\/\/jdhitsolutions.com\/blog\/category\/powershell\/"},"img":{"alt_text":"handshake","src":"https:\/\/i0.wp.com\/jdhitsolutions.com\/blog\/wp-content\/uploads\/2013\/01\/handshake.gif?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":1701,"url":"https:\/\/jdhitsolutions.com\/blog\/powershell\/1701\/friday-fun-convert-object-to-hash-table\/","url_meta":{"origin":2752,"position":5},"title":"Friday Fun Convert Object to Hash Table","author":"Jeffery Hicks","date":"October 21, 2011","format":false,"excerpt":"I've been working on a few PowerShell projects recently and one requirement I had was to turn an object into a hash table. I thought this was something that was already handled in PowerShell but I couldn't find a cmdlet or an easy .NET technique. So I wrote my own\u2026","rel":"","context":"In "Friday Fun"","block_context":{"text":"Friday Fun","link":"https:\/\/jdhitsolutions.com\/blog\/category\/friday-fun\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"https:\/\/jdhitsolutions.com\/blog\/wp-json\/wp\/v2\/posts\/2752","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jdhitsolutions.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jdhitsolutions.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jdhitsolutions.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jdhitsolutions.com\/blog\/wp-json\/wp\/v2\/comments?post=2752"}],"version-history":[{"count":0,"href":"https:\/\/jdhitsolutions.com\/blog\/wp-json\/wp\/v2\/posts\/2752\/revisions"}],"wp:attachment":[{"href":"https:\/\/jdhitsolutions.com\/blog\/wp-json\/wp\/v2\/media?parent=2752"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jdhitsolutions.com\/blog\/wp-json\/wp\/v2\/categories?post=2752"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jdhitsolutions.com\/blog\/wp-json\/wp\/v2\/tags?post=2752"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}