tool::chmod-detail
chmod 777
rwxrwxrwx
World Writable — Dangerous!
Permission Structure
Owner (User)
✓Read (r)
✓Write (w)
✓Execute (x)
Group
✓Read (r)
✓Write (w)
✓Execute (x)
Others
✓Read (r)
✓Write (w)
✓Execute (x)
Octal
777Symbolic
rwxrwxrwxExplanation
chmod 777 grants read, write, and execute permissions to everyone — owner, group, and all other users. Any user on the system can modify and execute the file, creating severe security vulnerabilities. It should never be used on production systems or any environment accessible from the internet.
Common Use Cases
- ▸Temporary shared directories in isolated Docker dev containers
- ▸Build cache in fully isolated local development VMs
- ▸Temporary debugging workaround (must be reverted immediately)
- ▸File exchange directories within an isolated virtual machine
Security Considerations
⚠️ Never use 777 in production. A 777-permissioned file on a web server allows attackers to upload and execute malicious code. If you feel you need 777, first consider changing ownership (chown), using ACLs, or switching to group-based permissions (775/664) to solve the underlying problem more safely.
Command Examples
$ chmod 777 /tmp/shared-cache # temporary — revert immediately$ # Never use in production$ # Alternative: use group permissions: chmod 775 /shared$ # Or change ownership: chown www-data:www-data /var/wwwRelated Permissions
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