chmod 630 Permission Explained
Summary: chmod 630 gives the owner read/write, the group write/execute, and everyone else no access.
| Class | Read (4) | Write (2) | Execute (1) | Octal |
|---|---|---|---|---|
| Owner (u) | 6 | |||
| Group (g) | 3 | |||
| Others (o) | 0 |
chmod 630 filename
chmod 630 Breakdown
| Class | Digit | Symbolic | On a file | On a directory |
|---|---|---|---|---|
| Owner (u) | 6 |
rw- |
Read and write | Can list names, cannot enter |
| Group (g) | 3 |
-wx |
Write and execute | Can enter and create/delete files, but not list |
| Others (o) | 0 |
--- |
No access | Cannot list, enter, or modify |
Is chmod 630 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
630 is uncommon in standard Linux setups. The closest widely used permission is chmod 600.
chmod 630 Command Examples
# Apply using octal mode
chmod 630 filename
# Apply using equivalent symbolic mode
chmod u=rw,g=wx,o= filename
# Recursive command warning:
chmod -R 630 /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 630 {} +
# Verify permissions
stat -c '%a %A %n' filename # Linux
stat -f '%Lp %Sp %N' filename # macOS
# Example ls -l output:
-rw--wx--- 1 alice staff 1024 Jan 15 10:00 example.txtumask Relationship
A umask of 147 makes new directories 630. Test umask values with our interactive Umask Calculator.
Frequently Asked Questions
What does chmod 630 mean?
chmod 630 gives the owner read/write, the group write/execute, and everyone else no access. In octal notation, the owner receives 6 (read/write), the group receives 3 (write/execute), and others receive 0 (no access).
Is chmod 630 safe?
chmod 630 is classified as Moderate. Every member of the group can modify this file.
What is chmod 630 in symbolic notation?
In symbolic notation, chmod 630 is represented as rw--wx---. You can apply this permission using the equivalent symbolic command "chmod u=rw,g=wx,o= filename".
Related Permissions
Change one bit: