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chmod calculator

Octal and symbolic Unix permissions, in both directions.

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ReadWriteExecute
Owner
Group
Others

Common values

644rw-r--r--Regular file: owner writes, everyone reads
600rw-------Private file, e.g. a key or a config with secrets
755rwxr-xr-xScript or directory: everyone can run or enter
700rwx------Private directory
777rwxrwxrwxEverything for everyone. Almost never the right answer

On a directory, execute means the right to enter it and reach the files inside. A directory with read but no execute lists names and gives access to nothing.