If file does not contain string powershell

Question

I want to run a powershell command only if a certain string does not exist in a certain file.

This is my script

$pattern='<!--add key="MaxNumCycles" value="40"/-->'
$textToAdd=$pattern + '

    <!--RerunMode: 1 write to DB, 2 write to DB and add to RUN export/-->
    <add key="RerunMode" value="0"/>'

$filename="C\temp\Software.exe.config"

[IO.File]::ReadAllText($filename).Replace($pattern,$textToAdd) | Set-Content $filename -Force

If the $textToAdd string is not in $filename then I want to run this script. How do I go about this?

TheMadTechnician · Accepted Answer · 2017-05-05 23:20:34Z

1

That's simple enough, you just read the text in, pipe to Where, and perform the replace and Set-Content in a ForEach block.

$pattern='<!--add key="MaxNumCycles" value="40"/-->'
$textToAdd=$pattern + '

    <!--RerunMode: 1 write to DB, 2 write to DB and add to RUN export/-->
    <add key="RerunMode" value="0"/>'

$filename="C\temp\Software.exe.config"

[IO.File]::ReadAllText($filename)| Where{$_ -notlike "*$texttoadd*"} | ForEach{$_.Replace($pattern,$textToAdd) | Set-Content $filename -Force}

edited May 5, 2017 at 23:20

answered May 5, 2017 at 19:57

TheMadTechnician

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