Set-PathVariable.ps1 suggestions

[OnlineCop]

A few suggestions for Set-PathVariable.ps1:

1. The regex on line 45 should end with a $ to avoid a partial match.

   From:

       $arrPath = $arrPath | Where-Object { $_ -notMatch "^$path\\?" }
   

   To:

       $arrPath = $arrPath | Where-Object { $_ -notMatch "^$path\\?$" }
   

   Otherwise, Set-PathVariable -RemovePath 'C:\Temp' could incorrectly remove a path such as C:\Temp2.

2. The -join command on line 47 may leave an empty array element, creating a trailing semi-colon in the PATH:

   PS> $env:Path
   C:\Windows;C:\Windows\System32;C:\Temp
   PS> Set-PathVariable -RemovePath 'C:\Temp'
   PS> $env:Path
   C:\Windows;C:\Windows\System32;
   

   Change from:

       $value = ($arrPath + $addPath) -join ';'
   

   To:

       $value = ($arrPath + $AddPath | Where { $_ }) -join ';'
   

   The | Where { $_ } will remove empty/null elements, avoiding this problem:

   PS> $env:Path
   C:\Windows;C:\Windows\System32;C:\Temp
   PS> Set-PathVariable -RemovePath 'C:\Temp'
   PS> $env:Path
   C:\Windows;C:\Windows\System32
   

3. In addition to the above, using Group-Object could be a convenient way to remove duplicates:

       $value = ($arrPath + $AddPath | Where { $_ } | Group-Object).Name -join ';'
   

   Example (note the additional C:\Windows as well as a trailing ;):

   PS> $env:Path
   C:\Windows;C:\Windows\System32;C:\Temp;C:\Windows;
   PS> Set-PathVariable -RemovePath 'C:\Temp'
   PS> $env:Path
   C:\Windows;C:\Windows\System32