chmod 170 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

170

Symbolic

--xrwx---

Binary

001 111 000

Risk Level

Moderate

Summary: chmod 170 gives the owner execute, the group read/write/execute, and everyone else no access.

Class	Read (4)	Write (2)	Execute (1)	Octal
Owner (u)				1
Group (g)				7
Others (o)				0

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

Octal

Symbolic

Target File / Path

-R Recursive -v Verbose

170

--xrwx---

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

chmod 170 filename

Moderate Every member of the group can modify this file.

View the full chmod 170 guide →

chmod 170 Breakdown

Class	Digit	Symbolic	On a file	On a directory
Owner (u)	`1`	`--x`	Execute only	Can enter (cd) but not list contents
Group (g)	`7`	`rwx`	Full access	Full access: list, enter, create, delete
Others (o)	`0`	`---`	No access	Cannot list, enter, or modify

Is chmod 170 Safe?

Moderate

Every member of the group can modify this file.
Even the owner cannot modify this file without changing permissions first.
Scripts need read permission to run; only compiled binaries can be executed without it.
Unusual: a lower class has permissions the class above it lacks.

Common Use Cases

170 is uncommon in standard Linux setups. The closest widely used permission is chmod 770.

chmod 170 Command Examples

# Apply using octal mode
chmod 170 filename

# Apply using equivalent symbolic mode
chmod u=x,g=rwx,o= filename

# Recursive command warning:
chmod -R 170 /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 170 {} +

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

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

umask Relationship

A umask of 607 makes new directories 170. Test umask values with our interactive Umask Calculator.

Frequently Asked Questions

What does chmod 170 mean?

chmod 170 gives the owner execute, the group read/write/execute, and everyone else no access. In octal notation, the owner receives 1 (execute), the group receives 7 (read/write/execute), and others receive 0 (no access).

Is chmod 170 safe?

chmod 170 is classified as Moderate. Every member of the group can modify this file.

What is chmod 170 in symbolic notation?

In symbolic notation, chmod 170 is represented as --xrwx---. You can apply this permission using the equivalent symbolic command "chmod u=x,g=rwx,o= filename".