R help - Nov 2006 - gzfile with multiple entries in the archive

If I open a tgz archive with gzfile and then parse it using readLines I miss
the initial line of each member of the archive - and also the name of the
file although the archive otherwise complete (but useless!).

 

Is there any way within R to extract both the list of files in a tgz archive
and to extract any one of these files?

 

Clearly I can use zcat and tar on Linux, but I need this to work within the
R environment on Windows!

 

Thanks

 

John James


	[[alternative HTML version deleted]]

On Tue, 14 Nov 2006, John James wrote:
> If I open a tgz archive with gzfile and then parse it using readLines I
miss
> the initial line of each member of the archive - and also the name of the
> file although the archive otherwise complete (but useless!).
You can use a gzfile connection to read the underlying .tar file, but that 
is not a text file and you will need to pick its structure apart yourself 
via readBin and readChar.
> Is there any way within R to extract both the list of files in a tgz
archive
> and to extract any one of these files?
> Clearly I can use zcat and tar on Linux, but I need this to work within the
> R environment on Windows!
You could use tar on Windows: it is in the R tools set.

-- 
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)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

If you know how to use the unix/linux tools already, then you may want
to look at cygwin (http://www.cygwin.com/), it allows those of us
trapped in a windows world to still lead productive lives with the
unix/linux tools. 


-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at intermountainmail.org
(801) 408-8111
 

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of John James
Sent: Tuesday, November 14, 2006 5:07 AM
To: r-help at stat.math.ethz.ch
Subject: [R] gzfile with multiple entries in the archive

If I open a tgz archive with gzfile and then parse it using readLines I
miss the initial line of each member of the archive - and also the name
of the file although the archive otherwise complete (but useless!).

 

Is there any way within R to extract both the list of files in a tgz
archive and to extract any one of these files?

 

Clearly I can use zcat and tar on Linux, but I need this to work within
the R environment on Windows!

 

Thanks

 

John James


	[[alternative HTML version deleted]]

______________________________________________
R-help at stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.