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#### 14.8.2.22 `:tangle-mode`

The `tangle-mode` header argument controls the permission set on tangled files. The value of this header argument will be passed to `set-file-modes`. For example, to set a tangled file as read only use `:tangle-mode (identity #o444)`, or to set a tangled file as executable use `:tangle-mode (identity #o755)`. Blocks with `shebang` (shebang) header arguments will automatically be made executable unless the `tangle-mode` header argument is also used. The behavior is undefined if multiple code blocks with different values for the `tangle-mode` header argument are tangled to the same file.