AWK：man awk对BEGIN的执行解释木有看懂
没有读懂加粗的这句话在说什么，是说BEGIN{aaa}{bbb}和BEGIN{aaabbb}是等价的意思吗？
BEGIN and END are two special kinds of patterns which are not tested against the input. The action parts of all BEGIN patterns are merged as if all the statements had been written in a single BEGIN block. They are executed before any of the input is read.
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