Posts Tagged ‘chmod’
28
September
CHMOD Permissions
On computer filesystems, different files and directories have permissions that specify who and what can read, write, modify and access them.
An excellent FREE iphone app makes this easy for you – however it does help to explain it all so – here is the skinny for you.
Permission Modes
7 5 5 user group world r+w+x r+x r+x 4+2+1 4+0+1 4+0+1 = 755
The permission mode is computed by adding up the following values for the user, the file group, and for everyone else. The diagram shows how.
- Read 4 – Allowed to read files
- Write 2 – Allowed to write/modify files
- eXecute1 – Read/write/delete/modify/directory
7 4 4 user group world r+w+x r r 4+2+1 4+0+0 4+0+0 = 744
Example Permission Modes
| Mode | Str Perms | Explanation |
|---|---|---|
| 0477 | -r–rwxrwx | owner has read only (4), other and group has rwx (7) |
| 0677 | -rw-rwxrwx | owner has rw only(6), other and group has rwx (7) |
| 0444 | -r–r–r– | all have read only (4) |
| 0666 | -rw-rw-rw- | all have rw only (6) |
| 0400 | -r——– | owner has read only(4), group and others have no permission(0) |
| 0600 | -rw——- | owner has rw only, group and others have no permission |
| 0470 | -r–rwx— | owner has read only, group has rwx, others have no permission |
| 0407 | -r—–rwx | owner has read only, other has rwx, group has no permission |
| 0670 | -rw-rwx— | owner has rw only, group has rwx, others have no permission |
| 0607 | -rw—-rwx | owner has rw only, group has no permission and others have rwx |
