A simple Python script in the spirit of rubber_pipe.py to be able to use latexmk with pipes.

To install latexmk-pipe, simply use pip with

pip install [--user] .

Use the --user option to install latexmk-pipe locally.

You can use the latexmk-pipe executable to pass options "on the fly" to an existing LaTeX file. For instance:

echo "\PassOptionsToClass{answers,grades}{exam} \input{exam150128.tex} | latexmk-pipe > exam150128.sol.pdf

Temporary files are deleted if no errors are produced during the compilation process. The -outdir option can now be used.