chmod 530 Permission Explained

Notice: This is an unusual permission set: some classes have more access than the class above them. It is rarely correct in practice.

Octal

530

Symbolic

r-x-wx---

Binary

101 011 000

Risk Level

Moderate

Summary: chmod 530 gives the owner read/execute, the group write/execute, and everyone else no access.

Class	Read (4)	Write (2)	Execute (1)	Octal
Owner (u)				5
Group (g)				3
Others (o)				0

setuid (4) setgid (2) sticky bit (1)

Octal

Symbolic

Target File / Path

-R Recursive -v Verbose

530

r-x-wx---

Owner: read/execute · Group: write/execute · Others: no access

chmod 530 filename

Moderate Every member of the group can modify this file.

View the full chmod 530 guide →

chmod 530 Breakdown

Class	Digit	Symbolic	On a file	On a directory
Owner (u)	`5`	`r-x`	Read and execute	Can list and 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 530 Safe?

Moderate

Every member of the group can modify this file.
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

530 is uncommon in standard Linux setups. The closest widely used permission is chmod 500.

chmod 530 Command Examples

# Apply using octal mode
chmod 530 filename

# Apply using equivalent symbolic mode
chmod u=rx,g=wx,o= filename

# Recursive command warning:
chmod -R 530 /path/to/dir
# Note: -R applies the same mode to files and directories. Use find to treat them separately:
find /path/to/dir -type d -exec chmod 530 {} +

# Verify permissions
stat -c '%a %A %n' filename    # Linux
stat -f '%Lp %Sp %N' filename   # macOS

# Example ls -l output:
-r-x-wx--- 1 alice staff 1024 Jan 15 10:00 example.txt

umask Relationship

A umask of 247 makes new directories 530. Test umask values with our interactive Umask Calculator.

Frequently Asked Questions

What does chmod 530 mean?

chmod 530 gives the owner read/execute, the group write/execute, and everyone else no access. In octal notation, the owner receives 5 (read/execute), the group receives 3 (write/execute), and others receive 0 (no access).

Is chmod 530 safe?

chmod 530 is classified as Moderate. Every member of the group can modify this file.

What is chmod 530 in symbolic notation?

In symbolic notation, chmod 530 is represented as r-x-wx---. You can apply this permission using the equivalent symbolic command "chmod u=rx,g=wx,o= filename".