#两个字符串文件均由python生成
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#按数字排序
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#覆盖写
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cat hw1.txt | sort | uniq -d > 1.txt
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cat hw1.txt | sort -n | uniq -d > 1.txt
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#追加写
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cat hw1.txt | sort | uniq -d >> 2.txt
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cat hw1.txt | sort -n | uniq -d >> 2.txt
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#找出指定字符串
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grep computer hw1-2.txt
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grep -c computer hw1-2.txt
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