Run a task
task_run(id, context, filename = NULL)A task identifier
A context object
Filename to log all output to. This will sink the message stream as well as the output stream, so if specified (i.e., is non-NULL) then this function will apparently print no output to the console, which will make debugging more difficult when run interactively. However, when run non-interactively, especially on remote servers, this will allow collection of diagnostics that facilitate debugging.