readline
Read a Line from the Terminal
Description
Returns a character string that is one line of input.
Usage
readline(prompt = "")
Arguments
| prompt |
a character string to print to propmt the user to provide input.
|
Details
This function is useful for writing functions that interact with the
user.
Value
returns a character string giving the line read from the terminal.
This string contains all characters typed prior to an Enter
or Return, except leading and trailing spaces and tabs, which
are stripped. If readline is called from non-interactive mode
(for example, from a batch script), it returns an empty character
string.
See Also
Examples
ans <- readline("Do you want to continue? ")
if(ans=="n" || ans=="no") return()
reply <- readline()
if(nchar(reply) == 0) break else reply <- as.numeric(reply)