Either a path to a file, a connection, or literal data
(either a single string or a raw vector).
Files ending in .gz
, .bz2
, .xz
, or .zip
will
be automatically uncompressed. Files starting with http://
,
https://
, ftp://
, or ftps://
will be automatically
downloaded. Remote gz files can also be automatically downloaded &
decompressed.
Literal data is most useful for examples and tests. It must contain at
least one new line to be recognised as data (instead of a path).