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```
comm [options] <file1> <file2> # 逐行比较两个排序好的文件。
# 如不在选项中指定，默认输出三列。第一列为仅在file1中出现的内容，第二列为仅在file2中出现的内容，第三列为两个文件中都有的内容。
#### 选项
-1 # 仅显示第一列
-2 # 仅显示第二列
-3 # 仅显示第三列
--check-order
--nocheck-order
--output-delimiter=STR # 用STR分隔各列
--total
-z, --zero-terminated