chmod 770
chmod 770 is rwxrwx---.
What 770 grants
| Who | Digit | Permissions | Adds up as |
|---|---|---|---|
| Owner | 7 | read, write, execute | 4 + 2 + 1 = 7 |
| Group | 7 | read, write, execute | 4 + 2 + 1 = 7 |
| Others | 0 | no access | 0 |
When 770 is the right answer
Owner and group have full access, others get nothing. The right setting for a directory that a group works in together and nobody outside should see.
The command
chmod 770 filename
chmod -R 770 directory/Because the owner has the execute bit, this works on a directory as well as a file — on a directory, execute is what grants the right to enter it and reach the entries inside.
How it is written elsewhere
| Octal | 770 |
| Symbolic | rwxrwx--- |
As a file in ls -l | -rwxrwx--- |
As a directory in ls -l | drwxrwx--- |
| Binary | 111 111 000 |
| World-writable | No |
Frequently asked questions
What does chmod 770 mean?
It sets owner to read, write, execute, group to read, write, execute, others to no access. In symbolic notation that is rwxrwx---.
How do I apply 770?
Run chmod 770 filename. Add -R to apply it to a directory and everything inside, though be careful: a recursive numeric chmod marks every file the same way, which is rarely correct for a mixed tree of files and directories.
Is 770 safe?
It grants no write access outside the owner and the group, so it is a reasonable setting as long as the owner is the account you intend.
What is 770 in symbolic notation?
rwxrwx---. Written as ls -l shows it, with a leading file-type character, an ordinary file would appear as -rwxrwx--- and a directory as drwxrwx---.