chmod 031 Permission Explained
Summary: chmod 031 gives the owner no access, the group write/execute, and everyone else execute.
| Class | Read (4) | Write (2) | Execute (1) | Octal |
|---|---|---|---|---|
| Owner (u) | 0 | |||
| Group (g) | 3 | |||
| Others (o) | 1 |
chmod 031 filename
chmod 031 Breakdown
| Class | Digit | Symbolic | On a file | On a directory |
|---|---|---|---|---|
| Owner (u) | 0 |
--- |
No access | Cannot list, enter, or modify |
| 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 031 Safe?
Moderate
- Every member of the group can modify this file.
- Even the owner cannot modify this file without changing permissions first.
- Unusual: a lower class has permissions the class above it lacks.
Common Use Cases
031 is uncommon in standard Linux setups. The closest widely used permission is chmod 000.
chmod 031 Command Examples
# Apply using octal mode
chmod 031 filename
# Apply using equivalent symbolic mode
chmod u=,g=wx,o=x filename
# Recursive command warning:
chmod -R 031 /path/to/dir
# Note: -R applies the same mode to files and directories. Use find to treat them separately:
find /path/to/dir -type f -exec chmod 031 {} +
# Verify permissions
stat -c '%a %A %n' filename # Linux
stat -f '%Lp %Sp %N' filename # macOS
# Example ls -l output:
-----wx--x 1 alice staff 1024 Jan 15 10:00 example.txtumask Relationship
A umask of 746 makes new directories 031. Test umask values with our interactive Umask Calculator.
Frequently Asked Questions
What does chmod 031 mean?
chmod 031 gives the owner no access, the group write/execute, and everyone else execute. In octal notation, the owner receives 0 (no access), the group receives 3 (write/execute), and others receive 1 (execute).
Is chmod 031 safe?
chmod 031 is classified as Moderate. Every member of the group can modify this file.
What is chmod 031 in symbolic notation?
In symbolic notation, chmod 031 is represented as ----wx--x. You can apply this permission using the equivalent symbolic command "chmod u=,g=wx,o=x filename".
Related Permissions
Change one bit: