Removal of multiple entries in test file

This topic contains 4 replies, has 4 voices, and was last updated by  Daniel Krebs 2 years, 5 months ago.

  • Author
  • #24746

    Manoj D

    Hi Everyone,

    Need a help on a logic for which powershell script need to built. I have some files in txt which has " C:\Windows\system32;C:\Windows;C:\Windows\System32;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32" where C:\Windows\System32 is repeating 3 times which is not required. I need to replace the 3 entries as Single Entry. Can anyone help me out on the same.
    I tried replace string but the logic is missing, If we want to replace A then the value of A will change to B or whatever. But here I need to replace the 3 entries as Single entry.

    Thanks in advance if someone helpme out on this.

    [attachment file="Duplicate Values.txt"]

  • #24749


    I didn't spend much time with this, but the option below will work. Notice that it's going to make everything lower case (-Unique will think C:\Windows\system32 and C:\Windows\System32 are different unless we modify the case). If that's going to make an impact then someone (perhaps even me) will have to come up with a better idea.

    ((Get-Content C:\Duplicate-Values.txt) -split ';').ToLower() | Select-Object -Unique

    And, just in case you want to see this done (very) procedurally...

    $x = Get-Content C:\Duplicate-Values.txt
    $x = $x.Split(';')
    $x = $x.ToLower()
    $x = $x | Select-Object -Unique
    $x | Set-Content C:\Duplicate-Values.txt

    In the second example, we're writing over the original contents of Duplicate-Values.txt. You can do this in the first example by piping your Select-Object output to Set-Content.

  • #24807

    Manoj D

    Hi Tom,

    Thanks for your time. I think what I asked and what you suggest both are absolutely different. I just want to make 3 same entries as single entry.

  • #24812

    Simon Wåhlin

    Hi Manoj,

    I think tomy had a good solution.

    Please try out this example wich is just a variant of what tommy wrote:

    $String = "C:\Windows\system32;C:\Windows;C:\Windows\System32;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32"
    $PathList = $String.ToLower() -split ';'
    # $PathList is now a list of all entries
    # Select unique entries form list (remove all duplicates):
    $UniquePaths = $PathList | Select-Object -Unique
    # Combine list to a string again
    $NewString = $UniquePaths -join ';'
  • #24818

    Daniel Krebs


    Here is an alternative version which does not lowercase the path items.

    $Path = 'C:\Windows\system32;C:\Windows;C:\Windows\System32;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32'
    # Array which dynamically increases as required
    $Array = New-Object -TypeName System.Collections.ArrayList
    $Path -split ';' |  ForEach-Object { 
        if ($Array -notcontains $_) { 
    $NewPath = $Array -join ';'

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