R help - Nov 2011 - Setting hostname in the .Renvironment

This is a follow-up to a question I asked a few years back.  We have a pair
of computers that share a common home directory (and therefor a common
.Renviron) with identical hardware, but very different sets of libraries
such that using a "shared" R_LIBS between two computers does not work.
 They both use this as the default library for user installations:

'~/R/x86_64-pc-linux-gnu-library/2.13'

I would like to mod the .Renviron in such a way so

'~/R/hostname-1/x86_64-pc-linux-gnu-library/2.13'
'~/R/hostname-2/x86_64-pc-linux-gnu-library/2.13'

How can I modify my R_LIBS_USER in the .Renviron to match this?  The
hostname would need to be "dynamically" set based on which computer I
log
into, but I tried something like this:

R_LIBS_USER="~/lib/R/library/"$HOSTNAME"_%p_%a_%o_R%V"

and R did not resolve the $HOSTNAME environment variable even though I can
(from bash) echo $HOSTNAME and it return the correct name.

Thoughts?  Thanks!

--j


-- 
Jonathan A. Greenberg, PhD
Assistant Professor
Department of Geography
University of Illinois at Urbana-Champaign
607 South Mathews Avenue, MC 150
Urbana, IL 61801
Phone: 415-763-5476
AIM: jgrn307, MSN: jgrn307@hotmail.com, Gchat: jgrn307, Skype: jgrn3007
http://www.geog.illinois.edu/people/JonathanGreenberg.html

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On 21.11.2011 01:32, Jonathan Greenberg wrote:
> This is a follow-up to a question I asked a few years back.  We have a pair
> of computers that share a common home directory (and therefor a common
> .Renviron) with identical hardware, but very different sets of libraries
> such that using a "shared" R_LIBS between two computers does not
work.
>   They both use this as the default library for user installations:
>
> '~/R/x86_64-pc-linux-gnu-library/2.13'
>
> I would like to mod the .Renviron in such a way so
>
> '~/R/hostname-1/x86_64-pc-linux-gnu-library/2.13'
> '~/R/hostname-2/x86_64-pc-linux-gnu-library/2.13'
>
> How can I modify my R_LIBS_USER in the .Renviron to match this?  The
> hostname would need to be "dynamically" set based on which
computer I log
> into, but I tried something like this:
>
> R_LIBS_USER="~/lib/R/library/"$HOSTNAME"_%p_%a_%o_R%V"


Depends on the shells you are using and where it is defined, but you 
definitely need braces rather than quotes as in:


R_LIBS_USER="~/lib/R/library/${HOSTNAME}"


and I have to

export HOSTNAME ${HOSTNAME}

at first on the machines I am using to have it accessible for R.

Best,
Uwe Ligges



> and R did not resolve the $HOSTNAME environment variable even though I can
> (from bash) echo $HOSTNAME and it return the correct name.
>
> Thoughts?  Thanks!
>
> --j
>
>