R: Change size of move an existing file

file.resize {ff} | R Documentation

## Change size of move an existing file

### Description

Change size of an existing file (on some platforms sparse files are used) or move file to other name and/or location.

### Usage

      file.resize(path, size)
      file.move(from, to)

### Arguments

`path` | file path (on windows it uses a 'windows' backslash path!)
`size` | new filesize in bytes as double
`from` | old file path
`to` | new file path

### Details

`file.resize` can enlarge or shrink the file. When enlarged, the file is filled up with zeros. Some platform implementations feature sparse files, so that this operation is very fast. We have tested:

- Ubuntu Linux 8, i386

- FreeBSD 7, i386

- Gentoo Linux Virtual-Server, i386

- Gentoo Linux, x86_64

- Windows XP

The following work but do not support sparse files

- Mac OS X 10.5, i386

- Mac OS X 10.4, PPC

`file.move` tries to `file.rename`, if this fails (e.g. across file systems) the file is copied to the new location and the old file is removed, see `file.copy` and `file.remove`.

### Value

logical scalar repesenting the success of this operation

### Author(s)

Daniel Adler

### See Also

`file.create`, `file.rename`, `file.info`, `file.copy`, `file.remove`

### Examples

     x <- tempfile()
     newsize <- 23       # resize and size to 23 bytes.
     file.resize(x, newsize)
     file.info(x)$size == newsize
     ## Not run:
       newsize <- 8*(2^30) # create new file and size to 8 GB.
       file.resize(x, newsize)
       file.info(x)$size == newsize

    ## End(Not run)
     y <- tempfile()
     file.move(x,y)
     file.remove(y)

[Package ff version 2.2-13 Index]