chmod 064 Permission Explained
Summary: chmod 064 gives the owner no access, the group read/write, and everyone else read.
| Class | Read (4) | Write (2) | Execute (1) | Octal |
|---|---|---|---|---|
| Owner (u) | 0 | |||
| Group (g) | 6 | |||
| Others (o) | 4 |
chmod 064 filename
chmod 064 Breakdown
| Class | Digit | Symbolic | On a file | On a directory |
|---|---|---|---|---|
| Owner (u) | 0 |
--- |
No access | Cannot list, enter, or modify |
| Group (g) | 6 |
rw- |
Read and write | Can list names, cannot enter |
| Others (o) | 4 |
r-- |
Read only | Can list names, but not enter |
Is chmod 064 Safe?
Moderate
- 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
064 is uncommon in standard Linux setups. The closest widely used permission is chmod 664.
chmod 064 Command Examples
# Apply using octal mode
chmod 064 filename
# Apply using equivalent symbolic mode
chmod u=,g=rw,o=r filename
# Recursive command warning:
chmod -R 064 /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 064 {} +
# Verify permissions
stat -c '%a %A %n' filename # Linux
stat -f '%Lp %Sp %N' filename # macOS
# Example ls -l output:
----rw-r-- 1 alice staff 1024 Jan 15 10:00 example.txtumask Relationship
A umask of 713 makes new directories 064 and new files 064. Test umask values with our interactive Umask Calculator.
Frequently Asked Questions
What does chmod 064 mean?
chmod 064 gives the owner no access, the group read/write, and everyone else read. In octal notation, the owner receives 0 (no access), the group receives 6 (read/write), and others receive 4 (read).
Is chmod 064 safe?
chmod 064 is classified as Moderate. Every member of the group can modify this file.
What is chmod 064 in symbolic notation?
In symbolic notation, chmod 064 is represented as ---rw-r--. You can apply this permission using the equivalent symbolic command "chmod u=,g=rw,o=r filename".
Related Permissions
Change one bit: