chmod 331 Permission Explained
Summary: chmod 331 gives the owner write/execute, the group write/execute, and everyone else execute.
| Class | Read (4) | Write (2) | Execute (1) | Octal |
|---|---|---|---|---|
| Owner (u) | 3 | |||
| Group (g) | 3 | |||
| Others (o) | 1 |
chmod 331 filename
chmod 331 Breakdown
| Class | Digit | Symbolic | On a file | On a directory |
|---|---|---|---|---|
| Owner (u) | 3 |
-wx |
Write and execute | Can enter and create/delete files, but not list |
| Group (g) | 3 |
-wx |
Write and execute | Can enter and create/delete files, but not list |
| Others (o) | 1 |
--x |
Execute only | Can enter (cd) but not list contents |
Is chmod 331 Safe?
Moderate
- Every member of the group can modify this file.
- Scripts need read permission to run; only compiled binaries can be executed without it.
Common Use Cases
331 is uncommon in standard Linux setups. The closest widely used permission is chmod 711.
chmod 331 Command Examples
# Apply using octal mode
chmod 331 filename
# Apply using equivalent symbolic mode
chmod u=wx,g=wx,o=x filename
# Recursive command warning:
chmod -R 331 /path/to/dir
# Note: -R applies the same mode to files and directories. Use find to treat them separately:
find /path/to/dir -type d -exec chmod 331 {} +
# Verify permissions
stat -c '%a %A %n' filename # Linux
stat -f '%Lp %Sp %N' filename # macOS
# Example ls -l output:
--wx-wx--x 1 alice staff 1024 Jan 15 10:00 example.txtumask Relationship
A umask of 446 makes new directories 331. Test umask values with our interactive Umask Calculator.
Frequently Asked Questions
What does chmod 331 mean?
chmod 331 gives the owner write/execute, the group write/execute, and everyone else execute. In octal notation, the owner receives 3 (write/execute), the group receives 3 (write/execute), and others receive 1 (execute).
Is chmod 331 safe?
chmod 331 is classified as Moderate. Every member of the group can modify this file.
What is chmod 331 in symbolic notation?
In symbolic notation, chmod 331 is represented as -wx-wx--x. You can apply this permission using the equivalent symbolic command "chmod u=wx,g=wx,o=x filename".
Related Permissions
Change one bit: