chmod util
chmod permissions utility
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About
chmod util helps you understand and build Unix file permissions. Tap r, w, and x for the owner, group, and everyone else, and see the corresponding chmod number instantly.
Choose common modes such as 644, 755, and 600, each with a clear explanation of who gets access.
A built-in, manual explains the essentials:
- What read, write, and execute mean.
- How permissions differ for files and directories.
- How to remember the 4–2–1 rule.
- All eight permission patterns in a handy cheat sheet.
- Practical examples of chmod commands.
A small, focused companion for developers, students, and anyone learning Unix permissions.
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What's New in chmod util
2.0.0
October 13, 2026
A fresh look for chmod util, with a cleaner interface and a new rwx icon. - Clear explanations for owner, group, and others. - Common permission modes with helpful descriptions. - A terminal-inspired guide covering permissions, the 4–2–1 memory aid, and practical chmod examples. - An eight-pattern permission cheat sheet. - Updated support for modern iOS and macOS versions
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