{"id":3757,"date":"2014-03-25T12:11:22","date_gmt":"2014-03-25T16:11:22","guid":{"rendered":"http:\/\/jdhitsolutions.com\/blog\/?p=3757"},"modified":"2014-03-28T13:45:35","modified_gmt":"2014-03-28T17:45:35","slug":"convert-a-string-to-a-powershell-property-name","status":"publish","type":"post","link":"https:\/\/jdhitsolutions.com\/blog\/powershell\/3757\/convert-a-string-to-a-powershell-property-name\/","title":{"rendered":"Convert a String to a PowerShell Property Name"},"content":{"rendered":"

\"talkbubble\"<\/a>Over the last few years I've written and presented a bit on the idea of turning command line tools into PowerShell tools. We have a lot of great CLI based tools that are still worth using. What I've done is come up with tools and techniques for turning their output into an object that can be used in the PowerShell pipeline. Often all I need to do is parse and clean up command line output. But one thing that has always nagged me is what to use for property names.<\/p>\n

For example, I can pretty easily turn output from the ARP.EXE command into objects. Here's what I start with.
\n\"arp-a\"<\/a><\/p>\n

What I want to do is take the column headings and turn them into properties. The problem is I don't like spaces in property names. Plus, I would need to know in advance the command line heading so I could use something like a custom hashtable to rename. I was after something a bit more convenient and something that would work with almost any command line output, although I think tabular output works best. Thus I came up with a short function I call Convert-StringProperty.<\/p>\n

Function Convert-StringProperty {\r\n\r\n<#\r\n.Synopsis\r\nConvert strings to proper case property names.\r\n.Description\r\nThis function will take strings like principal_id and convert it into a form\r\nmore suitable for a property name, ie PrincipalID. If the text doesn't contain\r\nthe delimiter, which by default is a single space, then the first character will\r\nbe set to upper case. Otherwise, the string is is split on the delimiter, each\r\nfirst character is set to upper case and then everything joined back together.\r\n\r\n.Example\r\nPS C:\\> Convert-StringProperty principal_id\r\nPrincipalId\r\n.Example\r\nPS C:\\> $raw = arp -g | select -Skip 2\r\n\r\nThis command will get ARP data. It can then be processed using this function:\r\n\r\nPS C:\\> [regex]$rx=\"\\s{2,}\"\r\nPS C:\\> $properties = $rx.Split($raw[0].trim()) | Convert-StringProperty  \r\nPS C:\\> for ($i=1;$i -lt $raw.count; $i++) {\r\n  $splitData = $rx.split($raw[$i].Trim())\r\n  #create an object for each entry\r\n  $hash = [ordered]@{}\r\n  for ($j=0;$j -lt $properties.count;$j++) {\r\n    $hash.Add($properties[$j],$splitData[$j])\r\n  } \r\n  [pscustomobject]$hash\r\n}\r\n\r\nInternetAddress                     PhysicalAddress                        Type                                       \r\n---------------                     ---------------                        ----                                       \r\n172.16.10.1                         00-13-d3-66-50-4b                      dynamic                                    \r\n172.16.10.100                       00-0d-a2-01-07-5d                      dynamic                                    \r\n172.16.10.101                       2c-76-8a-3d-11-30                      dynamic                                    \r\n172.16.10.199                       00-0a-cd-25-28-99                      dynamic                                    \r\n172.16.10.254                       20-4e-7f-b5-0f-1a                      dynamic                                    \r\n172.16.100.1                        c4-3d-c7-48-16-ee                      dynamic                                    \r\n172.16.255.255                      ff-ff-ff-ff-ff-ff                      static                                     \r\n224.0.0.22                          01-00-5e-00-00-16                      static                                     \r\n224.0.0.251                         01-00-5e-00-00-fb                      static                                     \r\n224.0.0.252                         01-00-5e-00-00-fc                      static                                     \r\n239.255.255.250                     01-00-5e-7f-ff-fa                      static                                     \r\n255.255.255.255                     ff-ff-ff-ff-ff-ff                      static\r\n.Notes\r\nLast Updated: 3\/27\/2014\r\nVersion     : 0.9.6\r\n\r\nLearn more:\r\n PowerShell in Depth: An Administrator's Guide\r\n PowerShell Deep Dives \r\n Learn PowerShell 3 in a Month of Lunches \r\n Learn PowerShell Toolmaking in a Month of Lunches \r\n\r\n   ****************************************************************\r\n   * DO NOT USE IN A PRODUCTION ENVIRONMENT UNTIL YOU HAVE TESTED *\r\n   * THOROUGHLY IN A LAB ENVIRONMENT. USE AT YOUR OWN RISK.  IF   *\r\n   * YOU DO NOT UNDERSTAND WHAT THIS SCRIPT DOES OR HOW IT WORKS, *\r\n   * DO NOT USE IT OUTSIDE OF A SECURE, TEST SETTING.             *\r\n   ****************************************************************\r\n\r\n.Link\r\nhttp:\/\/jdhitsolutions.com\/blog\/2014\/03\/convert-a-string-to-a-powershell-property-name\r\n#>\r\n\r\n[cmdletbinding()]\r\nParam(\r\n[Parameter(Position=0,Mandatory=$True,\r\nHelpMessage=\"Enter a string to convert\",\r\nValueFromPipeline=$True,\r\nValueFromPipelineByPropertyName=$True)]\r\n[ValidateNotNullorEmpty()]\r\n[Alias(\"name\")]\r\n[string]$Text,\r\n\r\n[ValidateNotNullorEmpty()]\r\n[string]$Delimiter = \" \"\r\n\r\n)\r\n\r\nBegin {\r\n    Write-Verbose -Message \"Starting $($MyInvocation.Mycommand)\"  \r\n    Write-Verbose \"Using delimiter: $Delimiter\"\r\n\r\n    #define a regular expression pattern\r\n    [regex]$rx = \"[^$Delimiter]+\"\r\n\r\n} #begin\r\n\r\nProcess {\r\n    Write-Verbose \"Converting $Text\"\r\n    #initialize the output string for the new property name\r\n    [string]$Output=\"\"\r\n\r\n    #find each word\r\n    $rx.Matches($text) | foreach {\r\n\r\n      #capitalize the first letter of each word\r\n      $value = \"{0}{1}\" -f $_.value[0].tostring().ToUpper(),$_.value.tostring().substring(1).ToLower()\r\n\r\n      #and add to output stipping off any extra non word characters\r\n      $output+=  $Value -replace \"\\W+\",\"\"\r\n\r\n    } #foreach\r\n\r\n    #send the new string to the pipeline\r\n    $Output\r\n    $counter++\r\n} # process\r\n\r\nEnd {\r\n    Write-Verbose -Message \"Ending $($MyInvocation.Mycommand)\"\r\n} #end\r\n\r\n} #end function<\/pre>\n
Here's how it works. I'll take the raw ARP output and skip the first couple of lines.<\/p>\n
$raw = arp -g | select -Skip 2<\/pre>\n
The $raw variable has the data I want to turn into objects.<\/p>\n
  \r\nInternet Address      Physical Address      Type\r\n  172.16.10.1           00-13-d3-66-50-4b     dynamic\r\n  172.16.10.100         00-0d-a2-01-07-5d     dynamic\r\n  172.16.10.101         2c-76-8a-3d-11-30     dynamic\r\n  172.16.10.199         00-0a-cd-25-28-99     dynamic\r\n  172.16.10.254         20-4e-7f-b5-0f-1a     dynamic\r\n  172.16.30.212         94-de-80-84-8d-4d     dynamic\r\n  172.16.100.1          c4-3d-c7-48-16-ee     dynamic\r\n  172.16.255.255        ff-ff-ff-ff-ff-ff     static\r\n  224.0.0.22            01-00-5e-00-00-16     static\r\n  224.0.0.251           01-00-5e-00-00-fb     static\r\n  224.0.0.252           01-00-5e-00-00-fc     static\r\n  239.255.255.246       01-00-5e-7f-ff-f6     static\r\n  239.255.255.250       01-00-5e-7f-ff-fa     static\r\n  255.255.255.255       ff-ff-ff-ff-ff-ff     static<\/pre>\n
The first line contains the property names but I want them without the spaces. As a separate step, outside of the function, I need to split the first line. I'm going to do that with a regular expression pattern that matches 2 or more white spaces.<\/p>\n
[regex]$rx=\"\\s{2,}\"\r\n$properties = $rx.Split($raw[0].trim()) | Convert-StringProperty<\/pre>\n
I can take the first line, item [0], remove leading and trailing spaces and split it. This will give me three strings: Internet Address, Physical Address, and Type. Each of these is then piped to my Convert-StringProperty.<\/p>\n
The function will look at each string and split it again based on a delimiter, which by default is a space. But you can specify something different if you run into CLI names like INTERNET_ADDRESS. Each word is then processed with a capital first letter. The end result is camel case so \"Internet Address\" becomes \"InternetAddress\".<\/p>\n
Once I know what my property names will be, I can continue parsing the command line output and create a custom object.<\/p>\n
for ($i=1;$i -lt $raw.count; $i++) {\r\n  $splitData = $rx.split($raw[$i].Trim())\r\n  #create an object for each entry\r\n  $hash = [ordered]@{}\r\n  for ($j=0;$j -lt $properties.count;$j++) {\r\n    $hash.Add($properties[$j],$splitData[$j])\r\n  } \r\n  [pscustomobject]$hash\r\n}<\/pre>\n
You still need to come up with code to process your command line tool, but you can use this function to define proper PowerShell properties. Here's one more example.<\/p>\n
$raw = qprocess\r\n$properties = $raw[0] -split \"\\s{2,}\" | Convert-StringProperty\r\n$raw | select -Skip 1 | foreach {\r\n #split each line\r\n $data = $_ -split \"\\s{2,}\"\r\n $hash=[ordered]@{}\r\n for ($i=0;$i -lt $properties.count;$i++) {\r\n   #strip off any non word characters\r\n   $hash.Add($properties[$i],($data[$i] -replace '\\W+',''))\r\n }\r\n [pscustomobject]$hash\r\n}<\/pre>\n
This takes command output like this:<\/p>\n
 USERNAME              SESSIONNAME         ID    PID  IMAGE\r\n jeff                  services             0   1920  sqlservr.exe\r\n>jeff                  console              1   3312  taskhostex.exe\r\n>jeff                  console              1   3320  ipoint.exe\r\n>jeff                  console              1   3328  itype.exe<\/pre>\n
And turns it into PowerShell output like this:<\/p>\n
Username    : jeff\r\nSessionname : services\r\nId          : 0\r\nPid         : 1920\r\nImage       : sqlservrexe\r\n\r\nUsername    : jeff\r\nSessionname : console\r\nId          : 1\r\nPid         : 3312\r\nImage       : taskhostexexe\r\n\r\nUsername    : jeff\r\nSessionname : console\r\nId          : 1\r\nPid         : 3320\r\nImage       : ipointexe<\/pre>\n
In another article I'll share with you another tool that takes advantage of this function. Enjoy.<\/p>\n","protected":false},"excerpt":{"rendered":"
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