chmod 667 Permission Explained
Summary: chmod 667 gives the owner read/write, the group read/write, and everyone else read/write/execute.
| Class | Read (4) | Write (2) | Execute (1) | Octal |
|---|---|---|---|---|
| Owner (u) | 6 | |||
| Group (g) | 6 | |||
| Others (o) | 7 |
chmod 667 filename
chmod 667 Breakdown
| Class | Digit | Symbolic | On a file | On a directory |
|---|---|---|---|---|
| Owner (u) | 6 |
rw- |
Read and write | Can list names, cannot enter |
| Group (g) | 6 |
rw- |
Read and write | Can list names, cannot enter |
| Others (o) | 7 |
rwx |
Full access | Full access: list, enter, create, delete |
Is chmod 667 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.
- Unusual: a lower class has permissions the class above it lacks.
Common Use Cases
667 is uncommon in standard Linux setups. The closest widely used permission is chmod 666.
chmod 667 Command Examples
# Apply using octal mode
chmod 667 filename
# Apply using equivalent symbolic mode
chmod u=rw,g=rw,o=rwx filename
# Recursive command warning:
chmod -R 667 /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 667 {} +
# Verify permissions
stat -c '%a %A %n' filename # Linux
stat -f '%Lp %Sp %N' filename # macOS
# Example ls -l output:
-rw-rw-rwx 1 alice staff 1024 Jan 15 10:00 example.txtumask Relationship
A umask of 110 makes new directories 667. Test umask values with our interactive Umask Calculator.
Frequently Asked Questions
What does chmod 667 mean?
chmod 667 gives the owner read/write, the group read/write, and everyone else read/write/execute. In octal notation, the owner receives 6 (read/write), the group receives 6 (read/write), and others receive 7 (read/write/execute).
Is chmod 667 safe?
chmod 667 is classified as Critical Risk. Anyone on the system can modify or replace this file.
What is chmod 667 in symbolic notation?
In symbolic notation, chmod 667 is represented as rw-rw-rwx. You can apply this permission using the equivalent symbolic command "chmod u=rw,g=rw,o=rwx filename".
Related Permissions
Change one bit: