用linux命令分析文件-排序-统计（sort, uniq, awk）
[root@bogon 桌面]# cat booklist.txt
9787302115199
9787302142201
9787302115199
9787115242907
9787115253293
9787302115199
9787302142201
9787115253293
[root@bogon 桌面]# sort booklist.txt | uniq -c | awk '$1>=2 {print $0}'
2 9787115253293
3 9787302115199
2 9787302142201
[root@bogon 桌面]# sort booklist.txt | uniq -c | awk '$1>=2 {print $0}' >booklist-multi.txt
9787302115199
9787302142201
9787302115199
9787115242907
9787115253293
9787302115199
9787302142201
9787115253293
[root@bogon 桌面]# sort booklist.txt | uniq -c | awk '$1>=2 {print $0}'
2 9787115253293
3 9787302115199
2 9787302142201
[root@bogon 桌面]# sort booklist.txt | uniq -c | awk '$1>=2 {print $0}' >booklist-multi.txt
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