projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 1094cf0a KT |
1 | .pa 1 |
| 2 | .he 'DIRECTORY (V)'3/15/72'DIRECTORY (V)' | |
| 3 | .ti 0 | |
| 4 | NAME format of directories | |
| 5 | .sp | |
| 6 | .ti 0 | |
| 7 | DESCRIPTION A direc\ 6tory | |
| 8 | behaves exactly like an ordinary file, save that no | |
| 9 | user may write into a directory. | |
| 10 | The fact that a file is a directory is indicated by | |
| 11 | a bit in the flag word of its i-node entry. | |
| 12 | ||
| 13 | Directory entries are 10 bytes long. | |
| 14 | The first word is the i-number of the file represented | |
| 15 | by the entry, if non-zero; if zero, the entry is empty. | |
| 16 | ||
| 17 | Bytes 2-9 represent the (8-character) | |
| 18 | file name, null padded on the right. | |
| 19 | These bytes are not cleared for empty slots. | |
| 20 | ||
| 21 | By convention, the first two entries in each directory | |
| 22 | are for "." and "..". The first is an entry for the | |
| 23 | directory itself. The second is for the parent | |
| 24 | directory. | |
| 25 | The meaning of ".." is modified for the root directory | |
| 26 | of the master file system and for the root directories of removable | |
| 27 | file systems. | |
| 28 | In the first case, there is no parent, and in the second, | |
| 29 | the system does not permit off-device references. | |
| 30 | Therefore in both cases ".." has the | |
| 31 | same meaning as ".". | |
| 32 | .sp | |
| 33 | .ti 0 | |
| 34 | SEE ALSO file system (V) |