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#### 14.8.2 Specific header arguments

The following header arguments are defined:

- var: Pass arguments to code blocks
- results: Specify the type of results and how they will be collected and handled
- file: Specify a path for file output
- dir: Specify the default (possibly remote) directory for code block execution
- exports: Export code and/or results
- tangle: Toggle tangling and specify file name
- comments: Toggle insertion of comments in tangled code files
- no-expand: Turn off variable assignment and noweb expansion during tangling
- session: Preserve the state of code evaluation
- noweb: Toggle expansion of noweb references
- cache: Avoid re-evaluating unchanged code blocks
- hlines: Handle horizontal lines in tables
- colnames: Handle column names in tables
- rownames: Handle row names in tables
- shebang: Make tangled files executable
- eval: Limit evaluation of specific code blocks