chmod 603 Permission Explained
Summary: chmod 603 gives the owner read/write, the group no access, and everyone else write/execute.
| Class | Read (4) | Write (2) | Execute (1) | Octal |
|---|---|---|---|---|
| Owner (u) | 6 | |||
| Group (g) | 0 | |||
| Others (o) | 3 |
chmod 603 filename
chmod 603 Breakdown
| Class | Digit | Symbolic | On a file | On a directory |
|---|---|---|---|---|
| Owner (u) | 6 |
rw- |
Read and write | Can list names, cannot enter |
| Group (g) | 0 |
--- |
No access | Cannot list, enter, or modify |
| Others (o) | 3 |
-wx |
Write and execute | Can enter and create/delete files, but not list |
Is chmod 603 Safe?
Critical Risk
- Anyone on the system can modify or replace this file.
- Unusual: a lower class has permissions the class above it lacks.
Common Use Cases
603 is uncommon in standard Linux setups. The closest widely used permission is chmod 600.
chmod 603 Command Examples
# Apply using octal mode
chmod 603 filename
# Apply using equivalent symbolic mode
chmod u=rw,g=,o=wx filename
# Recursive command warning:
chmod -R 603 /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 603 {} +
# 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 174 makes new directories 603. Test umask values with our interactive Umask Calculator.
Frequently Asked Questions
What does chmod 603 mean?
chmod 603 gives the owner read/write, the group no access, and everyone else write/execute. In octal notation, the owner receives 6 (read/write), the group receives 0 (no access), and others receive 3 (write/execute).
Is chmod 603 safe?
chmod 603 is classified as Critical Risk. Anyone on the system can modify or replace this file.
What is chmod 603 in symbolic notation?
In symbolic notation, chmod 603 is represented as rw-----wx. You can apply this permission using the equivalent symbolic command "chmod u=rw,g=,o=wx filename".
Related Permissions
Change one bit: