Chmod Permissions Calculator
Interactive chmod permissions calculator to convert Linux file access rights between octal numbers, symbolic notation, and bash commands.
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All permission calculations, octal conversions, and shell commands are computed 100% locally in your browser. No system information is collected or sent anywhere.
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Interactive Permissions Matrix:
| Permission | Owner (User) | Group | Others (Public) |
|---|---|---|---|
| rRead (قراءة - 4) | |||
| wWrite (كتابة - 2) | |||
| xExecute (تنفيذ - 1) |
Read, Write/Modify, Execute/Enter
Read, Execute/Enter
Read, Execute/Enter
Ready-to-Run Bash Commands:
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Managing Linux and Unix file system access requires calculating binary octal codes and symbolic notation flags across owners, groups, and world users. This visual calculator translates between numerical values like 755 and 644, standard directory permissions, symbolic representations like -rwxr-xr-x, and special bit modifiers including SUID, SGID, and Sticky bits. It provides plain language security explanations, permission auditing tips, and outputs copy-ready terminal commands, running 100% locally in your browser memory.
How to use Chmod Permissions Calculator
- Toggle the checkboxes for Read, Write, and Execute under Owner, Group, and Others.
- Alternatively, type a 3 or 4-digit octal number directly into the input field.
- Review the human-readable explanation of allowed and restricted capabilities.
- Copy the generated bash command directly into your terminal or shell script.
What you get
- Numeric octal value (e.g. 755, 644, 1777)
- Standard 10-character symbolic string (e.g. -rwxr-xr-x, drwxrwxrwt)
- Human-readable access rights description for owner, group, and public
- Ready-to-execute Linux terminal commands including recursive chmod -R
When to use Chmod Permissions Calculator
- Securing private SSH keys and SSL certificates with strict 600 or 400 permissions.
- Configuring web server folders (755) and static assets (644) for Nginx or Apache.
- Understanding special SUID and sticky bit flags on shared multi-user systems.
Frequently asked questions about Chmod Permissions Calculator
What does chmod 755 mean in Linux?
Chmod 755 gives the file owner full read, write, and execute permissions (7), while members of the group and all other users can read and execute the file but cannot modify or delete it (5).
Why should SSH private keys always be set to chmod 600?
OpenSSH refuses to load private keys that are readable by group or other users. Chmod 600 guarantees that only the owner has read and write access, preventing unauthorized key access.
What is the purpose of the Sticky Bit (1000)?
The sticky bit is typically applied to shared public directories like /tmp (chmod 1777). It allows any user to create files, but only the file's creator or the root user can delete or rename them.
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