| callr-package | Call R from R | 
| callr | Call R from R | 
| default_repos | Default value for the 'repos' option in callr subprocesses | 
| r | Evaluate an expression in another R session | 
| rcmd | Run an R CMD command | 
| rcmd_bg | Run an R CMD command in the background | 
| rcmd_copycat | Call and R CMD command, while mimicking the current R session | 
| rcmd_process | External R CMD Process | 
| rcmd_process_options | Create options for an rcmd_process object | 
| rcmd_safe | Run an R CMD command | 
| rcmd_safe_env | 'rcmd_safe_env' returns a set of environment variables that are more appropriate for 'rcmd_safe()'. It is exported to allow manipulating these variables (e.g. add an extra one), before passing them to the 'rcmd()' functions. | 
| rscript | Run an R script | 
| rscript_process | External 'Rscript' process | 
| rscript_process_options | Create options for an rscript_process object | 
| r_bg | Evaluate an expression in another R session, in the background | 
| r_copycat | Run an R process that mimics the current R process | 
| r_process | External R Process | 
| r_process_options | Create options for an r_process object | 
| r_safe | Evaluate an expression in another R session | 
| r_session | External R Session | 
| r_session_debug | Interactive debugging of persistent R sessions | 
| r_session_options | Create options for an r_session object | 
| r_vanilla | Run an R child process, with no configuration |