Need Help modifying a powershell script to check values from excel file

Hello,
I'm looking for a powershell script that would run on a login script, export the current username logged on, check if that username is listed in an excel\csv file on a share.
If it doesn't exists, then the script needs to run a command and add the name in the sheet.
If it does exists then do nothing and exit.

Unfortunately it has to be in Powershell and i'm not to keen on it, any advise please?
johnnyjonathanAsked:
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
It's an Excel file (XLS*) or CSV we are talking about? And which PowerShell release?
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johnnyjonathanAuthor Commented:
csv or xls could be anything, doesn't matter to me.
And how can i check which powershell?
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
Check with:   powershell "$PsVersionTable"  from outside of PowerShell, or in PowerShell itself just type the var  $PsVersionTable.
If PSVersion is not 4.0, and you are on W7/W2008R2 or above, I strongly advice to upgrade to 4.0.

Automating Excel is slower and more complicated than parsing and writing a CSV file. PS 4.0 also allows to append to a CSV (prior you had to rewrite the CSV completely), hence my question for the version.
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johnnyjonathanAuthor Commented:
Thanks for the explanation.
In that case, yes let's go with CSV.

and yes, the version is 4.
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
I'm assuming we not even need a CSV, but a simple text file will do.
$usrfile = '\\server\share\scripts\Users.txt'
if ( (get-content $usrfile) -notcontains $env:UserName )
{
  # Do something
  echo $env:UserName >> $usrfile
}

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johnnyjonathanAuthor Commented:
Anyway to get the same script in vbs?
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
This question has an clear, enforced restriction to be about PowerShell:
Unfortunately it has to be in Powershell
If anything, I would use a cmd.exe batch. VBS requires some coding overhead, without gaining anything.
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johnnyjonathanAuthor Commented:
batch is also viable, i simply can't relay on powershell since the environment  is too old
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
Batch file:
set usrfile=\\server\share\scripts\Users.txt
find /i "%UserName%" <%usrfile% >nul || (
  REM Do Something 
  echo %UserName%>> %usrfile%
)

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johnnyjonathanAuthor Commented:
Thanks! great help and great solution!
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