Tools to run system processes in the background. It can check if a
background process is running; wait on a background process to finish;
get the exit status of finished processes; kill background processes.
It can read the standard output and error of the processes, using
non-blocking connections. 'processx' can poll a process for standard
output or error, with a timeout. It can also poll several processes at
once.

Homepage:
https://CRAN.R-project.org/package=processx
