chmod 631 Permission Explained
Summary: chmod 631 gives the owner read/write, the group write/execute, and everyone else execute.
| Class | Read (4) | Write (2) | Execute (1) | Octal |
|---|---|---|---|---|
| Owner (u) | 6 | |||
| Group (g) | 3 | |||
| Others (o) | 1 |
chmod 631 filename
chmod 631 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) | 1 |
--x |
Execute only | Can enter (cd) but not list contents |
Is chmod 631 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
631 is uncommon in standard Linux setups. The closest widely used permission is chmod 711.
chmod 631 Command Examples
# Apply using octal mode
chmod 631 filename
# Apply using equivalent symbolic mode
chmod u=rw,g=wx,o=x filename
# Recursive command warning:
chmod -R 631 /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 631 {} +
# Verify permissions
stat -c '%a %A %n' filename # Linux
stat -f '%Lp %Sp %N' filename # macOS
# Example ls -l output:
-rw--wx--x 1 alice staff 1024 Jan 15 10:00 example.txtumask Relationship
A umask of 146 makes new directories 631. Test umask values with our interactive Umask Calculator.
Frequently Asked Questions
What does chmod 631 mean?
chmod 631 gives the owner read/write, the group write/execute, and everyone else execute. In octal notation, the owner receives 6 (read/write), the group receives 3 (write/execute), and others receive 1 (execute).
Is chmod 631 safe?
chmod 631 is classified as Moderate. Every member of the group can modify this file.
What is chmod 631 in symbolic notation?
In symbolic notation, chmod 631 is represented as rw--wx--x. You can apply this permission using the equivalent symbolic command "chmod u=rw,g=wx,o=x filename".
Related Permissions
Change one bit: