the_shell.txt

- in an *`R` console*, all commands that you input are interpreted by the program "`R`". E.g. the command `Sys.time()` is an `R` command, and if you type it into the `R`-console it returns today's date and time. 
- in a *terminal console* you usually specify a program to interpret your command. You can run the **`R`** Command `Sys.time()` from the shell in the following way: `Rscript -e "Sys.time()"`. 


```{r, results="asis", echo = FALSE, message=FALSE, warning = FALSE}
library(tidyverse)
library(glue)

tab <- tribble(
  ~command, ~desc,
  "Rscript", "refers to *the programm* you want to use, which is an executable located somewhere on your computer",
  "-e", "is *an argument* (which specifies that we want to run a single line of `R`-Code)",
  "'Sys.time()'", "is the *value* to the argument, in this case the command that we want to run",
) %>%
  mutate(col = RColorBrewer::brewer.pal(nrow(.), "Set1"))

pmap_chr(tab, function(command, desc,col){
  glue(  "<span style='color:{col}'>{command} </span>")
}) %>%
  paste(collapse = "")%>%
  paste("<code>",.,"</code>") %>%
  pander::pandoc.p()


pmap_chr(tab, function(command, desc,col){
  glue("<code style='color:{col};'>{command} </code> <span style = 'color: {col}'>{desc}</span>")
}) %>%
  pander::pandoc.list()


```