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#!/usr/bin/perl
use CGI qw(:standard);
...
$check->printgrades("test");
print "</div>\n";
print $cgi->end_html();

sub new {
    my ($class,$file,$answers,$grades,$script) = @_;
...
    open(GRADES,"<<$grades") or die "got error $! (".($!+0).")\n"; # p
+roblem right here
        ...
}

Software error: got error No such file or directory (2)

jddancks@debian-macbook:/var/www/roger/homeworks/hw13$ ls -l /var/www/
+roger/homeworks/hw13/grades4.txt
-rwxr-xr-x 1 jddancks jddancks 2095 Jan 16 16:30 /var/www/roger/homewo
+rks/hw13/grades4.txt