for ((i=1;i<=100;i++))
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>do echo $RANDOM | md5sum | cut -c 1-40 >>test.txt
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>done
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sort test.txt | uniq -u
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sort -n test.txt | uniq -u
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sort -n test.txt > test2.txt
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sort test.txt > test3.txt
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grep -c cc test.txt //因为没有computer字符串所以用cc来代替
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grep -n cc test.txt
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