Powershell add text to files if does not exist - powershell

Question

I would like to create a Powershell script that adds text to *.jsp *.sh *.cmd files. I would also like it to check if the text already exist in that file and if it does then it skips the file. So far I have found Select-String which will find the text in the file. How do I then use this information to add text to top of the files that do not have the text in them? I also found Add-Content which seems to add the content I want but I would like to do it at the beginning and have some logic to not just keep re-adding it every time I run the ps1.
Select-String -Pattern "TextThatIsInMyFile" -Path c:\Stuff\batch\*.txt
Add-Content -Path "c:\Stuff\batch\*.txt" -Value "`r`nThis is the last line"

Answer 1

Very similar to what #MikeWise has, but a little better optimized. I have it pulling the data and making the provider filter the files returned (much better than filtering afterwards). Then I pass it to a Where statement using Select-String's -quiet parameter to provide boolean $true/$false to the Where. That way only file that you want to look at are even looked at, and only those missing the text you need are altered.
Get-ChildItem "C:\Stuff\Batch\*" -Include *.jsp,*.sh,*.cmd -File |
Where{!(Select-String -SimpleMatch "TextThatIsInMyFile" -Path $_.fullname -Quiet)} |
ForEach{
$Path = $_.FullName
"TextThatIsInMyFile",(Get-Content $Path)|Set-Content $Path
}
Edit: As you discovered the \* does not work with -Recursive. Use the following if you need to recurse:
Get-ChildItem "C:\Stuff\Batch" -Include *.jsp,*.sh,*.cmd -File -Recurse

Answer 2

Refering to the manual: https://technet.microsoft.com/en-us/library/hh849903.aspx
Specifically:
Outputs
The output type is the type of the objects that the cmdlet emits.
• Microsoft.PowerShell.Commands.MatchInfo or System.Boolean
By default, the output is a set of MatchInfo objects, one for each match found.
If you use the Quiet parameter, the output is a Boolean value indicating whether the pattern was found.
I also think that you also need to do this per file. So (presumbably):
$files = Get-ChildItem "C:\Stuff\batch" -Filter *.txt
for ($i=0; $i -lt $files.Count; $i++)
{
$filename = $files[$i].FullName
$b = Select-String -Quiet -Pattern "TextThatIsInMyFile" -Path $fileName
if (-not $b)
{
Add-Content -Path $fileName -Value "`r`nTextThatIsInMyFile"
}
}
I tested this and I think it does what you want, i.e. adds the text to the end of files that do not have it, and not doing it more than once.