Linux 中的权限

ABCD
A－0， 十进制
B－user(u, 用户)
C－group(g, 组用户)
D－others(o, 其他用户)

+-----+---+--------------------------+
| rwx | 7 | Read, write and execute  |
| rw- | 6 | Read, write              |
| r-x | 5 | Read, and execute        |
| r-- | 4 | Read,                    |
| -wx | 3 | Write and execute        |
| -w- | 2 | Write                    |
| --x | 1 | Execute                  |
| --- | 0 | no permissions           |
+------------------------------------+

+------------+------+-------+
| Permission | Octal| Field |
+------------+------+-------+
| rwx------  | 0700 | User  |
| ---rwx---  | 0070 | Group |
| ------rwx  | 0007 | Other |
+------------+------+-------+

• 0755 Commonly used on web servers. The owner can read, write, execute. Everyone else can read and execute but not modify the file.

• 0777 Everyone can read write and execute. On a web server, it is not advisable to use ‘777’ permission for your files and folders, as it allows anyone to add malicious code to your server.

• 0644 Only the owner can read and write. Everyone else can only read. No one can execute the file.

• 0655 Only the owner can read and write, but not execute the file. Everyone else can read and execute, but cannot modify the file.

References

[1] https://stackoverflow.com/questions/14249467/os-mkdir-and-os-mkdirall-permission-value