R help - Aug 2005 - How to get the list of the files when you read zip file by gzfile or unz

Dear List,
 
Does somebody know how to get the filename lists in the ziped when
"gzfile" or "unz" command is used ?
 
Thanks for your help.
 
Shawn Lee


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On Wed, 24 Aug 2005, Shawn Lee wrote:
> Does somebody know how to get the filename lists in the ziped when
> "gzfile" or "unz" command is used ?
There is no list when gzfile() is used: a gzipped file is not a zip
archive.

unz() opens a single specified file in a zip archive.

AFAIK R does not directly support listing files in a zip archive as R
itself has no need of this.  However,

   tmp <- system(paste("unzip -l", zip_file_name), intern=TRUE)
   substring(tmp[-c(1:3, length(tmp)-0:1)], 29)

looks about right.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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