Changing File Permissions
On computer filesystems, different files and directories have permissions that specify who and what can read, write, modify and access them.
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
6 4 4
user group world
r+w r r
4+2+0 4+0+0 4+0+0 = 644
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 |
Tags
config