tldr/pages/common/eqn.md

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# eqn
> Equation preprocessor for the groff (GNU Troff) document formatting system.
> See also `troff` and `groff`.
> More information: <https://manned.org/eqn>.
- Process input with equations, saving the output for future typesetting with groff to PostScript:
`eqn {{path/to/input.eqn}} > {{path/to/output.roff}}`
- Typeset an input file with equations to PDF using the [me] macro package:
`eqn -T {{pdf}} {{path/to/input.eqn}} | groff -{{me}} -T {{pdf}} > {{path/to/output.pdf}}`