Chmod Calculator

Linux Permissions Tool

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Chmod 644

Owner can read, write. Group can read. Others can read.

Numeric Notation

644

Symbolic Notation

rw-r--r--

Command

chmod 644 file

Permission Breakdown

Detailed view of permissions for each user category

Owner
✓ Read✓ Write✗ Execute
Group
✓ Read✗ Write✗ Execute
Others
✓ Read✗ Write✗ Execute

For Files

chmod 644 filename.txt
Changes permissions of a single file
chmod 644 *.txt
Changes permissions of all .txt files
After applying chmod 644, files will display as:
rw-r--r-- filename.txt

For Directories

chmod 644 dirname
Changes permissions of a directory
chmod -R 644 dirname
Recursively changes all files and subdirectories
After applying chmod 644, directories will display as:
drw-r--r-- dirname

Common Use Cases for Chmod 644

1
Configuration Files
Perfect for config files that should be readable by all but only writable by the owner.
2
Web Content
Ideal for HTML, CSS, and other web files that need to be read by the web server.
3
Documentation
Great for README files and documentation that everyone should read.

Related Chmod Codes

Explore similar permission configurations

642
rw-r---w-
643
rw-r---wx
645
rw-r--r-x
646
rw-r--rw-
755
rwxr-xr-x
777
rwxrwxrwx

Try the Interactive Calculator

Experiment with different permission combinations

Understanding Chmod 644

The chmod 644 command sets specific file permissions in Linux and Unix systems. This permission configuration owner can read, write. group can read. others can read.

In the numeric notation 644, each digit represents the permission level for different user categories. The symbolic representation rw-r--r-- provides a visual way to understand these permissions, where 'r' means read, 'w' means write, 'x' means execute, and '-' means no permission.

When you execute chmod 644 filename, you're modifying the file's access control list to match this specific permission pattern. This is essential for maintaining proper security and access control in multi-user environments.