chmod 577 Permission Explained
Summary: chmod 577 gives the owner read/execute, the group read/write/execute, and everyone else read/write/execute.
| Class | Read (4) | Write (2) | Execute (1) | Octal |
|---|---|---|---|---|
| Owner (u) | 5 | |||
| Group (g) | 7 | |||
| Others (o) | 7 |
chmod 577 filename
chmod 577 Breakdown
| Class | Digit | Symbolic | On a file | On a directory |
|---|---|---|---|---|
| Owner (u) | 5 |
r-x |
Read and execute | Can list and enter |
| Group (g) | 7 |
rwx |
Full access | Full access: list, enter, create, delete |
| Others (o) | 7 |
rwx |
Full access | Full access: list, enter, create, delete |
Is chmod 577 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
577 is uncommon in standard Linux setups. The closest widely used permission is chmod 777.
chmod 577 Command Examples
# Apply using octal mode
chmod 577 filename
# Apply using equivalent symbolic mode
chmod u=rx,g=rwx,o=rwx filename
# Recursive command warning:
chmod -R 577 /path/to/dir
# Note: -R applies the same mode to files and directories. Use find to treat them separately:
find /path/to/dir -type d -exec chmod 577 {} +
# Verify permissions
stat -c '%a %A %n' filename # Linux
stat -f '%Lp %Sp %N' filename # macOS
# Example ls -l output:
-r-xrwxrwx 1 alice staff 1024 Jan 15 10:00 example.txtumask Relationship
A umask of 200 makes new directories 577. Test umask values with our interactive Umask Calculator.
Frequently Asked Questions
What does chmod 577 mean?
chmod 577 gives the owner read/execute, the group read/write/execute, and everyone else read/write/execute. In octal notation, the owner receives 5 (read/execute), the group receives 7 (read/write/execute), and others receive 7 (read/write/execute).
Is chmod 577 safe?
chmod 577 is classified as Critical Risk. Anyone on the system can modify or replace this file.
What is chmod 577 in symbolic notation?
In symbolic notation, chmod 577 is represented as r-xrwxrwx. You can apply this permission using the equivalent symbolic command "chmod u=rx,g=rwx,o=rwx filename".
Related Permissions
Change one bit: