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  1. or download this
    if ($shell ne "" and $shell !~ /false|null/) {
  # it's ok
}
  2. or download this
    if ($shell ne "" and $shell !~ /false/ and $shell !~ /null/) {
  # it's ok
}
  3. or download this
    "foo" =~ /foo/;
print grep //, qw( bar foobar );  # foobar