| unzip {utils} | R Documentation |
Extract files from or list a zip archive.
unzip(zipfile, files = NULL, list = FALSE, overwrite = TRUE,
junkpaths = FALSE, exdir = ".", unzip = "internal", setTimes = FALSE)
zipfile |
The pathname of the zip file: tilde expansion (see
|
files |
A character vector of recorded filepaths to be extracted: the default is to extract all files. |
list |
If |
overwrite |
If |
junkpaths |
If |
exdir |
The directory to extract files to (the equivalent of
|
unzip |
The method to be used. An alternative is to use
|
setTimes |
logical. For the internal method only, should the file time be set based on the times in the zip file? (NB: this applies to files, not to directories. |
If list = TRUE, a data frame with columns Name
(character) Length (the size of the uncompressed file, numeric)
and Date (of class "POSIXct").
Otherwise for the "internal" method, a character vector of the
filepaths extracted to, invisibly.
The default internal method is a minimal implementation, principally
designed for Windows' users to be able to unpack Windows binary
packages without external software. It does not (for example) support
Unicode filenames as introduced in zip 3.0: for that use
unzip = "unzip" with unzip 6.00 or later. (As from
R 2.14.0 it does have support for files of more than 4GB and
bzip2 compression.)
If unzip specifies a program, the format of the dates listed
with list = TRUE is unknown (on Windows it can even depend on
the current locale) and the return values could be NA or
expressed in the wrong timezone or misinterpreted (the latter being
far less likely as from unzip 6.00).
File times in zip files are stored in the style of MS-DOS, as local times to an accuracy of 2 seconds. This is not very useful when transferring zip files between machines (even across continents), so we chose not to restore them by default.
The internal C code uses zlib and is in particular based on the
contributed minizip application in the zlib sources
(from http://zlib.net) by Gilles Vollant.
unz to read a single component from a zip file.
zip.