chmod 670 Permission Explained
Summary: chmod 670 gives the owner read/write, the group read/write/execute, and everyone else no access.
| Class | Read (4) | Write (2) | Execute (1) | Octal |
|---|---|---|---|---|
| Owner (u) | 6 | |||
| Group (g) | 7 | |||
| Others (o) | 0 |
chmod 670 filename
chmod 670 Breakdown
| Class | Digit | Symbolic | On a file | On a directory |
|---|---|---|---|---|
| Owner (u) | 6 |
rw- |
Read and write | Can list names, cannot enter |
| Group (g) | 7 |
rwx |
Full access | Full access: list, enter, create, delete |
| Others (o) | 0 |
--- |
No access | Cannot list, enter, or modify |
Is chmod 670 Safe?
Moderate
- Every member of the group can modify this file.
- Unusual: a lower class has permissions the class above it lacks.
Common Use Cases
670 is uncommon in standard Linux setups. The closest widely used permission is chmod 660.
chmod 670 Command Examples
# Apply using octal mode
chmod 670 filename
# Apply using equivalent symbolic mode
chmod u=rw,g=rwx,o= filename
# Recursive command warning:
chmod -R 670 /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 670 {} +
# Verify permissions
stat -c '%a %A %n' filename # Linux
stat -f '%Lp %Sp %N' filename # macOS
# Example ls -l output:
-rw-rwx--- 1 alice staff 1024 Jan 15 10:00 example.txtumask Relationship
A umask of 107 makes new directories 670. Test umask values with our interactive Umask Calculator.
Frequently Asked Questions
What does chmod 670 mean?
chmod 670 gives the owner read/write, the group read/write/execute, and everyone else no access. In octal notation, the owner receives 6 (read/write), the group receives 7 (read/write/execute), and others receive 0 (no access).
Is chmod 670 safe?
chmod 670 is classified as Moderate. Every member of the group can modify this file.
What is chmod 670 in symbolic notation?
In symbolic notation, chmod 670 is represented as rw-rwx---. You can apply this permission using the equivalent symbolic command "chmod u=rw,g=rwx,o= filename".
Related Permissions
Change one bit: