您可以尝试执行此操作，但是如果文件很大，请小心，因为它将值保留在内存中.

You can try this but be careful if the file is huge as it keeps the values in memory.

awk -F, '!($1 FS $2 in dup){dup[$1 FS $2]=dup[$2 FS $1]; print}' <file>

相同的想法:

awk -F, '!(($1 FS $2 in dup)||($2 FS $1 in dup)){dup[$1 FS $2]; print}' <file>