R: Read a Line from the Terminal

readline {base} | R Documentation

## Read a Line from the Terminal

### Description

`readline` reads a line from the terminal

### Usage

    readline(prompt="")

### Arguments

`prompt` | the string printed when prompting the user for input. Should usually end with a space `" "`.

### Details

The prompt string will be truncated to a maximum allowed length, normally 256 chars (but can be changed in the source code).

### Value

A character vector of length one.

### Examples

    fun <- function() {
      ANSWER <- readline("Are you a satisfied R user? ")
      if (substr(ANSWER, 1, 1) == "n")
        cat("This is impossible.  YOU LIED!\n")
      else
        cat("I knew it.\n")
    }
    fun()

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