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instance method
FileTest#size?
File.size?(file_name) → Integer or nil
file.c
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static VALUE
rb_file_size_p(VALUE obj, VALUE fname)
{
struct stat st;
if (rb_stat(fname, &st) < 0) return Qnil;
if (st.st_size == 0) return Qnil;
return OFFT2NUM(st.st_size);
}
Returns nil if file_name doesn’t exist or has zero size, the size of the file otherwise.
file_name can be an IO object.