Reads the content of a local or an online text file.
.readText(con, ..., maxAge=getOption("R.rsp::downloadIfOlderThan", -Inf))Returns a character string.
A character string specifying a local file or a URL,
or a connection.
Not used.
A numeric scalar specifying the maximum age (in seconds)
of cached URL contents before downloading and recaching.
If zero or less, the URL will always be downloaded.
When reading online URLs, it may take time a significant time to
read its content. If the content is changing rarely, it is possible
to cache the content locally. If a cached version is found, then it
is read instead.
It is possible to control how often a file should be recached. If the
cache is older than argument maxAge (in seconds), then the file
is redownloaded and recached.
All occurrences of \r\n and \r are replaced with
\n such that all lines are ending in \n regardless
of encoding.
Henrik Bengtsson