There are of course many programs that you do not want to issue any warnings if they cannot open certain files. Lots of application read in various, optional, configuration files, one in the current directory, one in the users home directory, and a system wide config file. Not all config files will exist, or are readable. You want the application to silently skip them. This is very acceptable code:

    foreach my $file (@files) {
        if (open my $fh => $file) {
            read in file
            do whatever you need to do
        }
    }
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-- Abigail