cat<=>tac
tac 1.txt >tac1.txt
tail 1.txt == head tac1.txt
cat<=>tac
tac 1.txt >tac1.txt
tail 1.txt == head tac1.txt
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cat<=>tac
tac 1.txt >tac1.txt
tail 1.txt == head tac1.txt
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cat<=>tac
tac 1.txt >tac1.txt
tail 1.txt == head tac1.txt