Shell – Add Increasing Numbers to Beginning of FileName in Powershell

I know how to accomplish this with Windows CMD shell after you change to the directory of your JPG files.

Save this script to a BAT file such as renamer.bat or any non-reserved command and execute it from your command prompt.

setlocal enabledelayedexpansion

set /a count=0
for /f "tokens=*" %%a in ('dir /b /od *.jpg') do (

    ren %%a ArbitraryString!count!.jpg
    set /a count+=1

)

Based on your question, it sounds like you also want to rename every *.jpg file something different than *.jpg, which would cream your file associations and make the images tedious to open. If this is REALLY TRUE, then substitute the Rename line with:

ren %%a ArbitraryString!count!.!count!jpg

Powershell using itextsharp.dll. The below evaluates the text on each page of each pdf for keywords, then exports any matches to a csv. You can run with this to rename files if matches are found, move them to categorized folders, and the likes.

EDIT: Github page for itextsharp indicates it is end-of-life and links to Itext7 https://github.com/itext/itext7-dotnet (dual licensed as AGPL/Commercial software, seems free for non-commercial use.)

Add-Type -Path "C:\path_to_dll\itextsharp.dll"
$pdfs = gci "C:\path_to_pdfs" *.pdf
$export = "C:\path_to_export\export.csv"
$results = @()
$keywords = @('Keyword1','Keyword2','Keyword3')

foreach($pdf in $pdfs) {

    Write-Host "processing -" $pdf.FullName

    # prepare the pdf
    $reader = New-Object iTextSharp.text.pdf.pdfreader -ArgumentList $pdf.FullName

    # for each page
    for($page = 1; $page -le $reader.NumberOfPages; $page++) {
    
        # set the page text
        $pageText = [iTextSharp.text.pdf.parser.PdfTextExtractor]::GetTextFromPage($reader,$page).Split([char]0x000A)

        # if the page text contains any of the keywords we're evaluating
        foreach($keyword in $keywords) {
            if($pageText -match $keyword) {
                $response = @{
                    keyword = $keyword
                    file = $pdf.FullName
                    page = $page
                }
                $results += New-Object PSObject -Property $response
            }
        }
    }
    $reader.Close()
}

Write-Host ""
Write-Host "done"

$results | epcsv $export -NoTypeInformation

The console output:

processing - C:\path_to_pdfs\1.pdf
processing - C:\path_to_pdfs\2.pdf
processing - C:\path_to_pdfs\3.pdf
processing - C:\path_to_pdfs\4.pdf
processing - C:\path_to_pdfs\5.pdf

done
PS C:\>

The csv output:

keyword    page    file
Keyword2   14      C:\path_to_pdfs\3.pdf
Keyword3   22      C:\path_to_pdfs\3.pdf
Keyword1   6       C:\path_to_pdfs\5.pdf