文本从尾到头输出
http://www.linuxidc.com/Linux/2007-05/4065.htm
cat<=>tac
tac 1.txt >tac1.txt
tail 1.txt == head tac1.txt
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文本从尾到头输出
阅读：40次
http://www.linuxidc.com/Linux/2007-05/4065.htm
cat<=>tac
tac 1.txt >tac1.txt
tail 1.txt == head tac1.txt