Usage
comm reads two files as input, regarded as lines of text. comm outputs one file, which contains three columns. The first two columns contain lines unique to the first and second file, respectively. The last column contains lines common to both. This functionally is similar to diff.
Columns are typically distinguished with the
For efficiency, standard implementations of comm expect both input files to be sequenced in the same line collation order, sorted lexically. The sort (Unix) command can be used for this purpose.
The comm algorithm makes use of the collating sequence of the current locale. If the lines in the files are not both collated in accordance with the current locale, the result is undefined.
Read more about this topic: Comm
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