chmod 513 Permission Explained
Summary: chmod 513 gives the owner read/execute, the group execute, and everyone else write/execute.
| Class | Read (4) | Write (2) | Execute (1) | Octal |
|---|---|---|---|---|
| Owner (u) | 5 | |||
| Group (g) | 1 | |||
| Others (o) | 3 |
chmod 513 filename
chmod 513 Breakdown
| Class | Digit | Symbolic | On a file | On a directory |
|---|---|---|---|---|
| Owner (u) | 5 |
r-x |
Read and execute | Can list and enter |
| Group (g) | 1 |
--x |
Execute only | Can enter (cd) but not list contents |
| Others (o) | 3 |
-wx |
Write and execute | Can enter and create/delete files, but not list |
Is chmod 513 Safe?
Critical Risk
- Anyone on the system can modify or replace 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
513 is uncommon in standard Linux setups. The closest widely used permission is chmod 711.
chmod 513 Command Examples
# Apply using octal mode
chmod 513 filename
# Apply using equivalent symbolic mode
chmod u=rx,g=x,o=wx filename
# Recursive command warning:
chmod -R 513 /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 513 {} +
# Verify permissions
stat -c '%a %A %n' filename # Linux
stat -f '%Lp %Sp %N' filename # macOS
# Example ls -l output:
-r-x--x-wx 1 alice staff 1024 Jan 15 10:00 example.txtumask Relationship
A umask of 264 makes new directories 513. Test umask values with our interactive Umask Calculator.
Frequently Asked Questions
What does chmod 513 mean?
chmod 513 gives the owner read/execute, the group execute, and everyone else write/execute. In octal notation, the owner receives 5 (read/execute), the group receives 1 (execute), and others receive 3 (write/execute).
Is chmod 513 safe?
chmod 513 is classified as Critical Risk. Anyone on the system can modify or replace this file.
What is chmod 513 in symbolic notation?
In symbolic notation, chmod 513 is represented as r-x--x-wx. You can apply this permission using the equivalent symbolic command "chmod u=rx,g=x,o=wx filename".
Related Permissions
Change one bit: