chmod 001 Permission Explained
Summary: chmod 001 gives the owner no access, the group no access, and everyone else execute.
| Class | Read (4) | Write (2) | Execute (1) | Octal |
|---|---|---|---|---|
| Owner (u) | 0 | |||
| Group (g) | 0 | |||
| Others (o) | 1 |
chmod 001 filename
chmod 001 Breakdown
| Class | Digit | Symbolic | On a file | On a directory |
|---|---|---|---|---|
| Owner (u) | 0 |
--- |
No access | Cannot list, enter, or modify |
| Group (g) | 0 |
--- |
No access | Cannot list, enter, or modify |
| Others (o) | 1 |
--x |
Execute only | Can enter (cd) but not list contents |
Is chmod 001 Safe?
Low Risk
- 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
001 is uncommon in standard Linux setups. The closest widely used permission is chmod 000.
chmod 001 Command Examples
# Apply using octal mode
chmod 001 filename
# Apply using equivalent symbolic mode
chmod u=,g=,o=x filename
# Recursive command warning:
chmod -R 001 /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 001 {} +
# Verify permissions
stat -c '%a %A %n' filename # Linux
stat -f '%Lp %Sp %N' filename # macOS
# Example ls -l output:
---------x 1 alice staff 1024 Jan 15 10:00 example.txtumask Relationship
A umask of 776 makes new directories 001. Test umask values with our interactive Umask Calculator.
Frequently Asked Questions
What does chmod 001 mean?
chmod 001 gives the owner no access, the group no access, and everyone else execute. In octal notation, the owner receives 0 (no access), the group receives 0 (no access), and others receive 1 (execute).
Is chmod 001 safe?
chmod 001 is classified as Low Risk. Even the owner cannot modify this file without changing permissions first.
What is chmod 001 in symbolic notation?
In symbolic notation, chmod 001 is represented as --------x. You can apply this permission using the equivalent symbolic command "chmod u=,g=,o=x filename".
Related Permissions
Change one bit: