comm Linux Command Cheatsheet
912
comm Linux Command compare two sorted files line by line and write to output, It requires two sorted files which it compares line by line.
Syntax
comm [OPTION]... FILE1 FILE2Options
| Option | Description |
|---|---|
| -1 | suppress printing of the first column (lines unique to the first file) |
| -2 | suppress printing of the second column (lines unique to the second file) |
| -3 | suppress printing of the third column (lines common to both the files) |
| –-check-order | check's the input is correctly sorted, even if all the input lines are pairable |
| –-nocheck-order | do not check that the input is correctly sorted |
| –-output-delimiter=STR | separate columns with string STR |
Example
$cat >file1.txt
one
two
three
$cat >file2.txt
one
three
four
$comm file1.txt file2.txt
one
three
four
two
three