Assuming your log file already exists (I named it "file.log" in the code below), this will check if your "test1.txt" exists in the log file:

#!/usr/bin/env perl
use warnings;
use strict;

my $file_found = 0;
my $desired_filename = 'test1.txt';

# Read log file and look to see if desired file is present
my $logfile = 'file.log';
open my $log_fh, '<', $logfile or die "Can not open $logfile for readi
+ng: $!\n";
while (<$log_fh>) {
    chomp;
    if ($_ eq $desired_filename) {
        $file_found = 1;
        last;
    }
}
close $log_fh or die "Can not close $logfile: $!\n";

# Print result
if ($file_found) {
    print "File $desired_filename found in log file.\n";
}
else {
    print "File $desired_filename NOT found in log file.\n";
}
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