You will need -d to test for directoryness. You can also use glob 
while (defined(my $subdir = glob 'antarctica/*')) {
    next unless -d $subdir;
    chdir $subdir;
    for ...
    chdir '../..';
}

[download]

or opendir and readdir: 

opendir my $D, 'antarctica' or die $!;
while (defined(my $dir = readdir $D)) {
    $dir = "antarctica/$dir";
    next unless -d $dir;
    chdir $dir;
    for ...
    chdir '..';

[download]
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: Execute a for loop in many subdirectories by choroba
in thread Execute a for loop in many subdirectories by marlowvoltron

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