pdf Write PDF graphics commands to a file
    postscript Writes PostScript graphics commands to
    a file
    xfig Device for XFIG graphics file format
    bitmap bitmap pseudo-device via
    Ghostscript (if available).
    pictex Writes TeX/PicTeX graphics commands to a
    file (of historical interest only)
  The following devices will be functional if R was compiled to use them (they exist but will return with a warning on other systems):
cairo_pdf, cairo_ps PDF and PostScript
    devices based on cairo graphics.
    svg SVG device based on cairo graphics.
    png PNG bitmap device
    jpeg JPEG bitmap device
    bmp BMP bitmap device
    tiff TIFF bitmap device
 unix     quartz The graphics device for the OS X
    native Quartz 2d graphics system.  (This is only functional on
    OS X where it can be used from the R.app GUI and from the
    command line: but it will display on the local screen even for a
    remote session.)
  
options("device") which is initially set as the most
  appropriate for each platform: a screen device for most interactive use and
  pdf (or the setting of R_DEFAULT_DEVICE)
  otherwise.  The exception is interactive use under Unix if no screen
  device is known to be available, when pdf() is used.It is possible for an R package to provide further graphics devices and several packages on CRAN do so. These include other devices outputting SVG and PGF/TiKZ (TeX-based graphics, see http://pgf.sourceforge.net/).
windows.options,
 unix
  X11.options, quartz.options,
  ps.options and pdf.options for how to
  customize devices.  dev.interactive,
  dev.cur, dev.print,
  graphics.off, image,
  dev2bitmap.
 unix
  capabilities to see if X11,
  jpeg png, tiff,
  quartz and the cairo-based devices are available.