chmod 430 Permission Explained
Summary: chmod 430 gives the owner read, the group write/execute, and everyone else no access.
| Class | Read (4) | Write (2) | Execute (1) | Octal |
|---|---|---|---|---|
| Owner (u) | 4 | |||
| Group (g) | 3 | |||
| Others (o) | 0 |
chmod 430 filename
chmod 430 Breakdown
| Class | Digit | Symbolic | On a file | On a directory |
|---|---|---|---|---|
| Owner (u) | 4 |
r-- |
Read only | Can list names, but not enter |
| Group (g) | 3 |
-wx |
Write and execute | Can enter and create/delete files, but not list |
| Others (o) | 0 |
--- |
No access | Cannot list, enter, or modify |
Is chmod 430 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
430 is uncommon in standard Linux setups. The closest widely used permission is chmod 400.
chmod 430 Command Examples
# Apply using octal mode
chmod 430 filename
# Apply using equivalent symbolic mode
chmod u=r,g=wx,o= filename
# Recursive command warning:
chmod -R 430 /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 430 {} +
# Verify permissions
stat -c '%a %A %n' filename # Linux
stat -f '%Lp %Sp %N' filename # macOS
# Example ls -l output:
-r---wx--- 1 alice staff 1024 Jan 15 10:00 example.txtumask Relationship
A umask of 347 makes new directories 430. Test umask values with our interactive Umask Calculator.
Frequently Asked Questions
What does chmod 430 mean?
chmod 430 gives the owner read, the group write/execute, and everyone else no access. In octal notation, the owner receives 4 (read), the group receives 3 (write/execute), and others receive 0 (no access).
Is chmod 430 safe?
chmod 430 is classified as Moderate. Every member of the group can modify this file.
What is chmod 430 in symbolic notation?
In symbolic notation, chmod 430 is represented as r---wx---. You can apply this permission using the equivalent symbolic command "chmod u=r,g=wx,o= filename".
Related Permissions
Change one bit: