Permissions & Security (Chmod/Chown/ACLs/SELinux/AppArmor)

Stop guessing why your script is hitting permission denied

🧩 The Challenge

You know the file has the right octal bits, but the application still throws a permission denied error. It’s one of those silent killers that ruins your day when everything looks fine on paper.

💡 The Fix

Use namei to walk the entire path and verify that the search permissions on every parent directory are actually open to your user. Most people miss the execute bit on a parent folder and go straight to chmodding the file itself.

namei -l /path/to/your/problematic/file

⚙️ Why It Works

This utility expands the path name and lists the permission bits for every single directory segment, making the invisible wall blocking your access pop right out at you.

🚀 Pro-Tip: Always verify the x bit on the parent directory, because a 777 file is useless if your user can’t even enter the folder it lives in.

Linux Tips & Tricks | © ngelinux.com | 9/22/2026