chmod 427 Permission Explained
Summary: chmod 427 gives the owner read, the group write, and everyone else read/write/execute.
| Class | Read (4) | Write (2) | Execute (1) | Octal |
|---|---|---|---|---|
| Owner (u) | 4 | |||
| Group (g) | 2 | |||
| Others (o) | 7 |
chmod 427 filename
chmod 427 Breakdown
| Class | Digit | Symbolic | On a file | On a directory |
|---|---|---|---|---|
| Owner (u) | 4 |
r-- |
Read only | Can list names, but not enter |
| Group (g) | 2 |
-w- |
Write only (rarely useful) | No practical effect without x |
| Others (o) | 7 |
rwx |
Full access | Full access: list, enter, create, delete |
Is chmod 427 Safe?
Critical Risk
- Anyone on the system can modify or replace this file.
- Every member of the group can modify this file.
- Any user can read this file — never use it for secrets such as keys or .env files.
- 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
427 is uncommon in standard Linux setups. The closest widely used permission is chmod 666.
chmod 427 Command Examples
# Apply using octal mode
chmod 427 filename
# Apply using equivalent symbolic mode
chmod u=r,g=w,o=rwx filename
# Recursive command warning:
chmod -R 427 /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 427 {} +
# Verify permissions
stat -c '%a %A %n' filename # Linux
stat -f '%Lp %Sp %N' filename # macOS
# Example ls -l output:
-r---w-rwx 1 alice staff 1024 Jan 15 10:00 example.txtumask Relationship
A umask of 350 makes new directories 427. Test umask values with our interactive Umask Calculator.
Frequently Asked Questions
What does chmod 427 mean?
chmod 427 gives the owner read, the group write, and everyone else read/write/execute. In octal notation, the owner receives 4 (read), the group receives 2 (write), and others receive 7 (read/write/execute).
Is chmod 427 safe?
chmod 427 is classified as Critical Risk. Anyone on the system can modify or replace this file.
What is chmod 427 in symbolic notation?
In symbolic notation, chmod 427 is represented as r---w-rwx. You can apply this permission using the equivalent symbolic command "chmod u=r,g=w,o=rwx filename".
Related Permissions
Change one bit: