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Header arguments consist of an initial colon followed by the name of the argument in lowercase letters. 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 | |
| • file-desc: | Specify a description for file results | |
| • dir: | Specify the default (possibly remote) directory for code block execution | |
| • exports: | Export code and/or results | |
| • tangle: | Toggle tangling and specify file name | |
| • mkdirp: | Toggle creation of parent directories of target files during tangling | |
| • comments: | Toggle insertion of comments in tangled code files | |
| • padline: | Control insertion of padding lines 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 | |
| • noweb-ref: | Specify block’s noweb reference resolution target | |
| • noweb-sep: | String used to separate noweb references | |
| • cache: | Avoid re-evaluating unchanged code blocks | |
| • sep: | Delimiter for writing tabular results outside Org | |
| • hlines: | Handle horizontal lines in tables | |
| • colnames: | Handle column names in tables | |
| • rownames: | Handle row names in tables | |
| • shebang: | Make tangled files executable | |
| • tangle-mode: | Set permission of tangled files | |
| • eval: | Limit evaluation of specific code blocks | |
| • wrap: | Mark source block evaluation results | |
| • post: | Post processing of code block results | |
| • prologue: | Text to prepend to code block body | |
| • epilogue: | Text to append to code block body |
Additional header arguments are defined on a language-specific basis, see Languages.
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