instance method File::Stat#world_readable?
world_readable? -> Fixnum | nil
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If stat is readable by others, returns an integer representing the file permission bits of stat. Returns nil otherwise. The meaning of the bits is platform dependent; on Unix systems, see stat(2).
m = File.stat("/etc/passwd").world_readable? # => 420 sprintf("%o", m) # => "644"
class File::Stat