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  1. or download this
    mkdir dir1 dir2
touch dir1/f{1,2}
  2. or download this
    foreach (1,2,3,4) {
print "dir1\n" if glob("dir1/f*");
print "dir2\n" if glob("dir2/f*");
}
  3. or download this
    print "dir1\n" if glob("dir1/f*");
print "dir2\n" if glob("dir2/f*");
...
print "dir2\n" if glob("dir2/f*");
print "dir1\n" if glob("dir1/f*");
print "dir2\n" if glob("dir2/f*");