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Access rights（permission）
Updated 2020/12/12
The Center for Science Information Users' Data is stored in the UNIX server. UNIX is an operating system that can be used by multiple users. In order to prevent conflict between users, three different rights to files and directories within UNIX may be set.
|
Read Permission r |
Write (Delete) Permission w |
Execute Permission x |
Characters and numbers that represent access rights
The three characters of access rights "rwx" are represented by a nine characters string like rwxr-xr-x or by a three-digit number such as 755.
Meaning of the three blocks
The nine characters string and the three-digit number are divided into three blocks to represent information.
| Owner | Group | Other | |
| Permission for file creator him or herself | Permission for users in the same group as the owner | Permission for all other users | |
| rwx | r-x | r-x | rwxr-xr-x |
| 7×100 | 5×10 | 5×1 | 755 |
Meaning of characters and numbers of access rights
When the access rights is expressed numerically, the sum of the numerical value for each 3 letters of each block is used.
| Character | Value | Meaning |
| r (read) | 4 | Read permission |
| w (write) | 2 | Write (Delete) permission |
| x (execute) | 1 | Execute permission |
| - | No permission |
Meaning of rwxr-xr-x 755 access rights
| Owner | Group | Other | |||||||
| Read | Write | Execute | Read | Write | Execute | Read | Write | Execute | |
| r | w | x | r | - | x | r | - | x | rwxr-xr-x |
| 4 | 2 | 1 | 4 | 1 | 4 | 1 | |||
| =7×100 | =5×10 | =5×1 | 755 | ||||||
| 〇 | 〇 | 〇 | 〇 | × | 〇 | 〇 | × | 〇 | |
By properly setting the access rights, the files and directories in the home directory (MyVolume) can be protected.
Files in public_html directory must be visible to the other users in order for one's own home page to be visible.