filelist

## Language and Locale settings -- but rather use Sys.getlocale()
s[grep("^L(ANG)", names(s))]

LANG               en_US.UTF-8

View(fn)
print(pwd())

Error in pwd() : could not find function "pwd"

dir()

 [1] "_config.yml"                 "ActionNote.txt"             
 [3] "DoSomething.R"               "Exploring_File_System.ipynb"
 [5] "filelist.Rmd"                "filesystemplay.py"          
 [7] "notebook1.Rmd"               "README.md"                  
 [9] "system_commands.ipynb"       "TEST copy.nb.html"          
[11] "TEST copy.Rmd"               "TEST.nb.html"               
[13] "TEST.Rmd"                    "Untitled.ipynb copy"        
[15] "weblist.md"                  "z.Rproj"                    

ls

function (name, pos = -1L, envir = as.environment(pos), all.names = FALSE, 
    pattern, sorted = TRUE) 
{
    if (!missing(name)) {
        pos <- tryCatch(name, error = function(e) e)
        if (inherits(pos, "error")) {
            name <- substitute(name)
            if (!is.character(name)) 
                name <- deparse(name)
            warning(gettextf("%s converted to character string", 
                sQuote(name)), domain = NA)
            pos <- name
        }
    }
    all.names <- .Internal(ls(envir, all.names, sorted))
    if (!missing(pattern)) {
        if ((ll <- length(grep("[", pattern, fixed = TRUE))) && 
            ll != length(grep("]", pattern, fixed = TRUE))) {
            if (pattern == "[") {
                pattern <- "\\["
                warning("replaced regular expression pattern '[' by  '\\\\['")
            }
            else if (length(grep("[^\\\\]\\[<-", pattern))) {
                pattern <- sub("\\[<-", "\\\\\\[<-", pattern)
                warning("replaced '[<-' by '\\\\[<-' in regular expression pattern")
            }
        }
        grep(pattern, all.names, value = TRUE)
    }
    else all.names
}
<bytecode: 0x7fe35a4613c8>
<environment: namespace:base>

Add a new chunk by clicking the Insert Chunk button on the toolbar or by pressing Cmd+Option+I.

When you save the notebook, an HTML file containing the code and output will be saved alongside it (click the Preview button or press Cmd+Shift+K to preview the HTML file).

The preview shows you a rendered HTML copy of the contents of the editor. Consequently, unlike Knit, Preview does not run any R code chunks. Instead, the output of the chunk when it was last run in the editor is displayed.