| .Dd 2015-10-08 |
| .Dt COMM 1 |
| .Os sbase |
| .Sh NAME |
| .Nm comm |
| .Nd select or reject lines common to two files |
| .Sh SYNOPSIS |
| .Nm |
| .Op Fl 123 |
| .Ar file1 |
| .Ar file2 |
| .Sh DESCRIPTION |
| .Nm |
| reads |
| .Ar file1 |
| and |
| .Ar file2, |
| which should both be sorted lexically, and writes three text columns |
| to stdout: |
| .Bl -tag -width Ds |
| .It 1 |
| Lines only in |
| .Ar file1 . |
| .It 2 |
| Lines only in |
| .Ar file2 . |
| .It 3 |
| Common lines. |
| .El |
| .Sh OPTIONS |
| .Bl -tag -width Ds |
| .It Fl 1 | Fl 2 | Fl 3 |
| Suppress column 1 | 2 | 3 |
| .El |
| .Sh SEE ALSO |
| .Xr cmp 1 , |
| .Xr sort 1 , |
| .Xr uniq 1 |
| .Sh STANDARDS |
| The |
| .Nm |
| utility is compliant with the |
| .St -p1003.1-2013 |
| specification. |