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## ----echo=FALSE----------------------------------------------------------
library("knitr")
Rscript_executable <- paste(file.path(R.home(), "bin", "Rscript"), "--vanilla")
opts_knit$set(root.dir = system.file("exec", package="optparse")) # to access the "Rscript files"
opts_chunk$set(comment=NA, echo=FALSE)
# setwd(system.file("exec", package="optparse")) # to access the "Rscript files"
list_file_command <- "ls"
chmod_command <- "chmod ug+x display_file.R example.R"
path_command <- "export PATH=$PATH:`pwd`"
run_command <- function(string) { suppressWarnings(cat(system(string, intern=TRUE), sep="\n")) }
## ------------------------------------------------------------------------
run_command(sprintf("%s", list_file_command))
command <- "display_file.R example.R" # to show file
## ------------------------------------------------------------------------
run_command(sprintf("%s %s 2>&1", Rscript_executable, command))
## ------------------------------------------------------------------------
command <- "example.R --help" # same as system("Rscript example.R -h")
## ------------------------------------------------------------------------
run_command(sprintf("%s %s 2>&1", Rscript_executable, command))
command <- "example.R" # rely only on defaults
## ------------------------------------------------------------------------
run_command(sprintf("%s %s 2>&1", Rscript_executable, command))
command <- "example.R --mean=10 --sd=10 --count=3"
## ------------------------------------------------------------------------
run_command(sprintf("%s %s 2>&1", Rscript_executable, command))
command <- "example.R --quiet -c 4 --generator=\"runif\"" # same as above but "quiet"
## ------------------------------------------------------------------------
run_command(sprintf("%s %s 2>&1", Rscript_executable, command))
command <- "example.R --silent -m 5" # same as above but "quiet"
## ------------------------------------------------------------------------
run_command(sprintf("%s %s 2>&1", Rscript_executable, command))
command <- "example.R -c 100 -c 2 -c 1000 -c 7" # same as above but "quiet"
## ------------------------------------------------------------------------
run_command(sprintf("%s %s 2>&1", Rscript_executable, command))
## ------------------------------------------------------------------------
command <- "display_file.R --help"
## ------------------------------------------------------------------------
run_command(sprintf("%s %s 2>&1", Rscript_executable, command))
command <- "display_file.R --add_numbers display_file.R"
## ------------------------------------------------------------------------
run_command(sprintf("%s %s 2>&1", Rscript_executable, command))
command <- "display_file.R non_existent_file.txt"
## ------------------------------------------------------------------------
run_command(sprintf("%s %s 2>&1", Rscript_executable, command))
command <- "display_file.R"
## ------------------------------------------------------------------------
run_command(sprintf("%s %s 2>&1", Rscript_executable, command))
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