readline reads a line from the terminal (in interactive use).
the string printed when prompting the user for input.
Should usually end with a space
The prompt string will be truncated to a maximum allowed length, normally 256 chars (but can be changed in the source code).
This can only be used in an interactive session.
A character vector of length one. Both leading and trailing spaces and tabs are stripped from the result.
In non-interactive use the result is as if the response was
RETURN and the value is
readLines for reading text lines from connections,
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