Linux: Wonderful use of the-comm command and the comm command

Linux: Wonderful use of the-comm command and the comm command
Parameter: // assume a, B, and AB intersection # comm [options] textA textBoptions: 1. This indicates that a removes the overlapping AB intersection; 2. indicates that B sets remove the AB overlapping part; 3. indicates that AB intersection overlaps the part; ------------------------------------1 indicates that a sets remove the AB overlapping part ), the remaining B sets; the value-2 indicates that the B sets are removed (excluding the AB overlapping part of the B sets), and the value-3 indicates that the AB overlapping part is removed;

So push down;

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Application scenarios:

File a content: file B content

1 2

2 3

3 4

4 5

It can be seen that the overlapping parts of file a and file B are 2, 3, and 4.

Comm-12 a B

Result: 2, 3, and 4