What is chmod and how does the calculator work?

chmod is a Unix command that changes file permissions. The calculator helps you determine the correct numeric (like 755) or symbolic (like rwxr-xr-x) values by converting between formats and providing visual feedback on permission combinations.

What are the different permission formats supported?

The calculator supports three formats: Numeric (octal like 755), Symbolic (readable like rwxr-xr-x), and Binary (internal representation). You can input any format and see conversions to the others instantly.

What do the permission values mean?

In numeric format: Read=4, Write=2, Execute=1. Each permission set (Owner/Group/Others) adds up these values. For example, rwx=7 (4+2+1), rw-=6 (4+2), r-x=5 (4+1), r--=4, -wx=3, -w-=2, --x=1, ---=0.

When should I use different permission presets?

Common presets: 755 (rwxr-xr-x) for executables and web files, 644 (rw-r--r--) for regular files, 600 (rw-------) for private files, 700 (rwx------) for private directories, and 777 (rwxrwxrwx) for temporary testing only.

How do I apply these permissions to my files?

Use the generated commands: 'chmod 755 filename' for files, 'chmod -R 755 dirname/' for directories and contents. The calculator provides examples for files, directories, and recursive operations.

Is it safe to use these permission values?

Yes, the calculator provides standard Unix permission values. However, always consider your security requirements. Avoid 777 permissions in production and use more restrictive settings for sensitive files and directories.

Chmod Calculator

Calculate Linux file permissions instantly with visual permission editor, preset configurations, and comprehensive command generation. Perfect for web server configuration, script permissions, and system administration with real-time validation and copy-to-clipboard functionality.

chmod

permissions

linux

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Quick Presets

Common permission presets for quick setup

Input & Settings

Use checkboxes to set permissions or enter values manually

How it works: Each permission category (Owner, Group, Others) has Read (4), Write (2), and Execute (1) values that add up. For example, rwx = 7, rw- = 6, r-x = 5. The three-digit result represents permissions for owner, group, and others respectively.

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