The fsck(1M) program runs in phases. Each phase reports any errors that it detects. ``Error message abbreviations in fsck output'' lists the abbreviations used in the fsck error messages. If the error is one that fsck can correct, you are asked if the correction should be made. This section describes the messages produced by each phase.
Error message abbreviations in fsck output
| BLK | block number |
| DUP | duplicate block number |
| DIR | directory name |
| MTIME | time file was last modified |
| UNREF | unreferenced |
| CG | cylinder group |
These single-letter abbreviations are used as placeholders in the error messages listed in this section, but they are replaced by the value described in the opposite them when the message appears on your screen:
| Abbreviation | Value it represents |
|---|---|
| B | block number |
| F | file (or directory) name |
| I | inode number |
| M | file mode |
| O | user ID of a file's owner |
| S | file size |
| T | time file was last modified |
| X | link count, |
| or | number of BAD, DUP, or MISSING blocks |
| or | number of files (depending on context) |
| Y | corrected link count umber |
| or | number of blocks in filesystem (depending on context) |
| Z | number of free blocks |