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#1 Free CHMOD Calculator: Instantly Calculate Linux File Permissions 2025

Advanced CHMOD Calculator

How to Use:

  1. Set Permissions: Check the boxes to grant Read (r), Write (w), and Execute (x) permissions for the Owner, Group, and Others.
  2. Set Special Permissions (Optional): Check the boxes for SetUID, SetGID, or Sticky Bit if needed.
  3. View Results: The calculator will instantly update the:
    • Octal Notation: (e.g., 755 or 4755)
    • Symbolic Notation: (e.g., rwxr-xr-x or rwsr-xr-t)
    • Full CHMOD Command: (e.g., chmod 755 your_file_or_directory)
  4. Action Log: See a log of changes and calculations below.
  5. Clear: Use the "Clear All Permissions" button to reset.

Understanding Octal: Read=4, Write=2, Execute=1. These are summed for each category (Owner, Group, Other). Special permissions prepend another octal digit (SetUID=4, SetGID=2, Sticky Bit=1).

Special Permissions:

Owner Permissions:

Group Permissions:

Other Permissions:

Calculated CHMOD Values:

Octal Notation: -
Symbolic Notation: -
CHMOD Command: chmod XXX your_file_or_directory

Action Log:

Calculator initialized. Check boxes to set permissions.

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