chmod 751
chmod 751 is rwxr-x--x.
What 751 grants
| Who | Digit | Permissions | Adds up as |
|---|---|---|---|
| Owner | 7 | read, write, execute | 4 + 2 + 1 = 7 |
| Group | 5 | read, execute | 4 + 1 = 5 |
| Others | 1 | execute | 1 = 1 |
When 751 is the right answer
Owner full, group read and traverse, others may traverse but not list. A deliberate choice when a path needs to be reachable without its contents being enumerable.
The command
chmod 751 filename
chmod -R 751 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 | 751 |
| Symbolic | rwxr-x--x |
As a file in ls -l | -rwxr-x--x |
As a directory in ls -l | drwxr-x--x |
| Binary | 111 101 001 |
| World-writable | No |
Frequently asked questions
What does chmod 751 mean?
It sets owner to read, write, execute, group to read, execute, others to execute. In symbolic notation that is rwxr-x--x.
How do I apply 751?
Run chmod 751 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 751 safe?
It grants no write access outside the owner, so it is a reasonable setting as long as the owner is the account you intend.
What is 751 in symbolic notation?
rwxr-x--x. Written as ls -l shows it, with a leading file-type character, an ordinary file would appear as -rwxr-x--x and a directory as drwxr-x--x.