chmod 543 Permission Explained
Summary: chmod 543 gives the owner read/execute, the group read, and everyone else write/execute.
| Class | Read (4) | Write (2) | Execute (1) | Octal |
|---|---|---|---|---|
| Owner (u) | 5 | |||
| Group (g) | 4 | |||
| Others (o) | 3 |
chmod 543 filename
chmod 543 Breakdown
| Class | Digit | Symbolic | On a file | On a directory |
|---|---|---|---|---|
| Owner (u) | 5 |
r-x |
Read and execute | Can list and enter |
| Group (g) | 4 |
r-- |
Read only | Can list names, but not enter |
| Others (o) | 3 |
-wx |
Write and execute | Can enter and create/delete files, but not list |
Is chmod 543 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
543 is uncommon in standard Linux setups. The closest widely used permission is chmod 740.
chmod 543 Command Examples
# Apply using octal mode
chmod 543 filename
# Apply using equivalent symbolic mode
chmod u=rx,g=r,o=wx filename
# Recursive command warning:
chmod -R 543 /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 543 {} +
# Verify permissions
stat -c '%a %A %n' filename # Linux
stat -f '%Lp %Sp %N' filename # macOS
# Example ls -l output:
-r-xr---wx 1 alice staff 1024 Jan 15 10:00 example.txtumask Relationship
A umask of 234 makes new directories 543. Test umask values with our interactive Umask Calculator.
Frequently Asked Questions
What does chmod 543 mean?
chmod 543 gives the owner read/execute, the group read, and everyone else write/execute. In octal notation, the owner receives 5 (read/execute), the group receives 4 (read), and others receive 3 (write/execute).
Is chmod 543 safe?
chmod 543 is classified as Critical Risk. Anyone on the system can modify or replace this file.
What is chmod 543 in symbolic notation?
In symbolic notation, chmod 543 is represented as r-xr---wx. You can apply this permission using the equivalent symbolic command "chmod u=rx,g=r,o=wx filename".
Related Permissions
Change one bit: