您最多选择25个主题
主题必须以字母或数字开头，可以包含连字符 (-)，并且长度不得超过35个字符
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sort data.txt | uniq -u
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sort -n data.txt | uniq -u
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sort data.txt > data2
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sort -n data.txt > data3
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sort data.txt >> data2
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sort -n data.txt >> data3
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grep ABC data.txt
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grep -o ABC data.txt
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grep ABC data.txt | wc -l
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grep -o ABC data.txt | wc
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