Explain Linux file permission patterns, practical access outcomes, and security posture for files and directories.
Enter a numeric or symbolic permission and choose whether you want to interpret it as a file or a directory.
Permission translation, practical meaning, and security posture for the selected context.
Owner can read the file and modify the file.
Group can read the file.
Others can read the file.
As a file permission set, 644 means the owner can read the file and modify the file, the group can read the file, and others can read the file.
As a directory permission set, 644 means the owner can list directory entries and create, rename, or delete entries, the group can list directory entries, and others can list directory entries.
This permission set is broadly balanced for many practical Linux scenarios. It is neither aggressively locked down nor obviously overexposed.
The same rwx triplet means different things depending on whether the target is a file or a directory.
For a file, read allows content viewing. For a directory, read allows listing entries.
For a file, write allows content changes. For a directory, write allows creating, renaming, and deleting entries when execute also allows traversal.
For a file, execute allows running it. For a directory, execute allows traversing or entering it.
Use the neighboring permission tools when you need translation or default-mode calculation.