chmod 027 Permission Explained
Summary: chmod 027 gives the owner no access, the group write, and everyone else read/write/execute.
| Class | Read (4) | Write (2) | Execute (1) | Octal |
|---|---|---|---|---|
| Owner (u) | 0 | |||
| Group (g) | 2 | |||
| Others (o) | 7 |
chmod 027 filename
chmod 027 Breakdown
| Class | Digit | Symbolic | On a file | On a directory |
|---|---|---|---|---|
| Owner (u) | 0 |
--- |
No access | Cannot list, enter, or modify |
| 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 027 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
027 is uncommon in standard Linux setups. The closest widely used permission is chmod 666.
chmod 027 Command Examples
# Apply using octal mode
chmod 027 filename
# Apply using equivalent symbolic mode
chmod u=,g=w,o=rwx filename
# Recursive command warning:
chmod -R 027 /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 027 {} +
# Verify permissions
stat -c '%a %A %n' filename # Linux
stat -f '%Lp %Sp %N' filename # macOS
# Example ls -l output:
-----w-rwx 1 alice staff 1024 Jan 15 10:00 example.txtumask Relationship
A umask of 750 makes new directories 027. Test umask values with our interactive Umask Calculator.
Frequently Asked Questions
What does chmod 027 mean?
chmod 027 gives the owner no access, the group write, and everyone else read/write/execute. In octal notation, the owner receives 0 (no access), the group receives 2 (write), and others receive 7 (read/write/execute).
Is chmod 027 safe?
chmod 027 is classified as Critical Risk. Anyone on the system can modify or replace this file.
What is chmod 027 in symbolic notation?
In symbolic notation, chmod 027 is represented as ----w-rwx. You can apply this permission using the equivalent symbolic command "chmod u=,g=w,o=rwx filename".
Related Permissions
Change one bit: