Help with String Formatting

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2 years, 2 months ago.

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  • #53017

    Participant
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    Hey All,

    Hoping the community can help with this one. I'm trying to put together a script that pulls the MAC addresses from computers in AD by grabbing the corresponding computer objects IP from DNS and than querying for MAC address. This snippet of my script grabs the MAC address successfully as a string but in doing so, there is either a NULL entry or blank space above the string. This causes issues when I try and pass this as a variable to a parameter in a CMDLET.

    Can someone assist in helping me get the string formatted correctly?

    $macentry=nbtstat -a $computer.hostname | select-string "mac address" | out-string
    $newmac=$macentry -replace ".*=" -replace ",.*"
    $newmac -replace " ", ""

  • #53021

    Keymaster
    Points: 1,619
    Helping HandTeam Member
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    Try running $newmac.Trim() against it to trim off whitespace. That's a method of System.String, if you want to look up more about it on MSDN. If it doesn't have any effect, then you're seeing something other than whitespace, although from here I can't tell you what that would be.

  • #53029

    Participant
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    Rank: Member

    Sounds like you're needing to Trim() the string of whitespace as the whitespace can cause issues. There may be a more efficient way but you can use:

    $macentry = nbtstat -a $computer.hostname | select-string "mac address" | out-string
    $newmac = $macentry -replace ".*=" -replace ",.*"
    ($newmac -replace " ", "").Trim()
    
  • #53035

    Participant
    Points: 21
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    Is there a reason you're opting to use nbtstat?

    gwmi -query "Select MACAddress From Win32_NetworkAdapterConfiguration Where IPEnabled = True"

  • #53048

    Participant
    Points: 0
    Rank: Member

    Since you are using Select-String, you are already using RegEx to match the pattern. Here is a way to uses RegEx groups to get just the MAC address.

    $macentry=nbtstat -a $computer.hostname | Select-String "MAC Address = (?'MACAddress'..-..-..-..-..-..)"
    $macentry.Matches[0].Groups['MACAddress'].value

    With your original code you are getting 3 sets of (Vertical Tab then Linefeed) after your MAC Address

    • #53053

      Participant
      Points: 0
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      Curtis,

      That did it for me! I know have the MAC address is proper format. Thanks for that.

      Thanks Everyone

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