Write an example shell.sh
file required by
make(..., parallelism = 'Makefile', prepend = 'SHELL=./shell.sh')
and do a `chmod +x` to enable execution.
Use this option to run your project in parallel on a computing cluster
or supercomputer.
shell_file(path = "shell.sh", overwrite = FALSE)
file path of the shell file
logical, whether to overwrite a possible destination file with the same name