comm
Select or reject lines common to two files (POSIX)
Syntax:
comm [-123] file1 file2
Runs on:
QNX Neutrino
Options:
- -1
- (
One
) Suppress the writing of lines found only in file1. - -2
- Suppress the writing of lines found only in file2.
- -3
- Suppress the writing of lines found in both file1 and file2.
- file1
- The pathname of the first file to be compared. If file1 is -, standard input is used.
- file2
- The pathname of the second file to be compared. If file2 is -, standard input is used.
Description:
The comm utility reads file1 and file2, which must be ordered in collating sequence (see the sort utility), and produces three text columns as output.
| This column: | Contains: |
|---|---|
| 1 | Lines found only in file1 |
| 2 | Lines found only in file2 |
| 3 | Lines found in both files |
Note:
QNX Neutrino also supports a toybox version of this utility.
For more information, go to the toybox entry of this reference.
Examples:
Print only the lines common to both files:
comm -12 test.dat save.dat
Files:
Standard input is used only if specified as a dash (-) command-line file parameter.
All input files must be text files for comm to produce a meaningful result.
The results of the comparison are written to standard output.
If any errors occur, comm writes diagnostic messages to standard error.
Exit status:
- 0
- All input files were successfully output as specified.
- >0
- An error occurred.
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