关于shell：Unix命令查找两个文件中常见的行 | 码农家园
https://www.codenong.com/373810/
Shell command to find lines common in two files - Stack Overflow
https://stackoverflow.com/questions/373810/shell-command-to-find-lines-common-in-two-files
(11条消息) linux shell脚本查找重复行/查找非重复行/去除重复行/重复行统计_pingD的专栏-CSDN博客_shell检查重复行
https://blog.csdn.net/pingD/article/details/78742471/