Append to Text File (Log) - Unique entries only

Thanks Stephen, That's what I figured. The file contents will need to be read in as some sort of array and then compared against fName. I wonder if I can just change the file extension when creating the log file to .csv?

var fileName = decodeURI(doc.name);

I wonder if I can just change the file extension when creating the log file to .csv? I do have the following code I used to read from an Excel doc saved as a CSV file. This first opens a dialog to chose a csv file. I'd replace it with a hardcoded path.

 //Open dialog to locate CSV file
    var csvFile = File.openDialog("Open Comma-delimited File","comma-delimited(*.csv):*.csv;"); 
        datafile = new File(csvFile); 
        
    //Open dialog to provide location of files to import
    var searchFolder = Folder.selectDialog ("Select folder to search in")  

    var csvString = []; 
        if (datafile.exists)    { 
          //open CSV file into memory
          datafile.open('r') ;
           // Skip first line
          datafile.readln();
          // read one line at a time until end of file 
        while(!datafile.eof)  {
            csvString.push( datafile.readln().replace(/^\s+|\s+$/g, '') ); 
      } 
      datafile.close();   //Close CSV after reading into memory
   } 

The thing then would be to make the comparison and IF the entry does not exist, append fName to the file.

I am learning to think, I am just behind on the doing!  I'm learning though.  😉

Thanks for the speedy response Kukurykus! That looks as if it's checking if the file exists, not the entry within the file. What I need is to check the contents of the file to prevent a duplicate entry if the filename already exists.

Thanks,