chmod 411 Permission Explained
Summary: chmod 411 gives the owner read, the group execute, and everyone else execute.
| Class | Read (4) | Write (2) | Execute (1) | Octal |
|---|---|---|---|---|
| Owner (u) | 4 | |||
| Group (g) | 1 | |||
| Others (o) | 1 |
chmod 411 filename
chmod 411 Breakdown
| Class | Digit | Symbolic | On a file | On a directory |
|---|---|---|---|---|
| Owner (u) | 4 |
r-- |
Read only | Can list names, but not enter |
| Group (g) | 1 |
--x |
Execute only | Can enter (cd) but not list contents |
| Others (o) | 1 |
--x |
Execute only | Can enter (cd) but not list contents |
Is chmod 411 Safe?
Low Risk
- 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
411 is uncommon in standard Linux setups. The closest widely used permission is chmod 400.
chmod 411 Command Examples
# Apply using octal mode
chmod 411 filename
# Apply using equivalent symbolic mode
chmod u=r,g=x,o=x filename
# Recursive command warning:
chmod -R 411 /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 411 {} +
# Verify permissions
stat -c '%a %A %n' filename # Linux
stat -f '%Lp %Sp %N' filename # macOS
# Example ls -l output:
-r----x--x 1 alice staff 1024 Jan 15 10:00 example.txtumask Relationship
A umask of 366 makes new directories 411. Test umask values with our interactive Umask Calculator.
Frequently Asked Questions
What does chmod 411 mean?
chmod 411 gives the owner read, the group execute, and everyone else execute. In octal notation, the owner receives 4 (read), the group receives 1 (execute), and others receive 1 (execute).
Is chmod 411 safe?
chmod 411 is classified as Low Risk. Even the owner cannot modify this file without changing permissions first.
What is chmod 411 in symbolic notation?
In symbolic notation, chmod 411 is represented as r----x--x. You can apply this permission using the equivalent symbolic command "chmod u=r,g=x,o=x filename".
Related Permissions
Change one bit: