chmod 243 Permission Explained
Summary: chmod 243 gives the owner write, the group read, and everyone else write/execute.
| Class | Read (4) | Write (2) | Execute (1) | Octal |
|---|---|---|---|---|
| Owner (u) | 2 | |||
| Group (g) | 4 | |||
| Others (o) | 3 |
chmod 243 filename
chmod 243 Breakdown
| Class | Digit | Symbolic | On a file | On a directory |
|---|---|---|---|---|
| Owner (u) | 2 |
-w- |
Write only (rarely useful) | No practical effect without x |
| 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 243 Safe?
Critical Risk
- Anyone on the system can modify or replace this file.
- Unusual: a lower class has permissions the class above it lacks.
Common Use Cases
243 is uncommon in standard Linux setups. The closest widely used permission is chmod 640.
chmod 243 Command Examples
# Apply using octal mode
chmod 243 filename
# Apply using equivalent symbolic mode
chmod u=w,g=r,o=wx filename
# Recursive command warning:
chmod -R 243 /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 243 {} +
# Verify permissions
stat -c '%a %A %n' filename # Linux
stat -f '%Lp %Sp %N' filename # macOS
# Example ls -l output:
--w-r---wx 1 alice staff 1024 Jan 15 10:00 example.txtumask Relationship
A umask of 534 makes new directories 243. Test umask values with our interactive Umask Calculator.
Frequently Asked Questions
What does chmod 243 mean?
chmod 243 gives the owner write, the group read, and everyone else write/execute. In octal notation, the owner receives 2 (write), the group receives 4 (read), and others receive 3 (write/execute).
Is chmod 243 safe?
chmod 243 is classified as Critical Risk. Anyone on the system can modify or replace this file.
What is chmod 243 in symbolic notation?
In symbolic notation, chmod 243 is represented as -w-r---wx. You can apply this permission using the equivalent symbolic command "chmod u=w,g=r,o=wx filename".
Related Permissions
Change one bit: