Question

I’m looking for a line of code that identifies missing files in a series of files and exports that list to a txt file. For example: a directory called 1to100000 contains pdfs named 1,2…99999,100000 but is missing some from the series. I would like the script to report those missing files to a txt file. Ideally this would be an executable perl script.
Thanks,
Jake

Answer 1

Just count from 1 to 100000 and check to see if the file exists.

foreach my $num ( 1 .. 100000 ) { 
    my $fname = "1to100000/$num.pdf";
    print "missing $fname\n" unless -f $fname;
}