[R] unix environment variables under R

[Jan Malte Wiener]

hi,
i am working on a little R-project with a couple od other guys.we use 
CVS, but everyone keeps the R-source files in different locations in his 
home-directory. of course this causes trouble when sourcing R-files. i 
thought a UNIX environment variable could be the solution, but R doesn't 
seem to know about the environment variables.
e.g. >> source("$PROJECT/xxx.R") results in
 >> Error in file(file, "r") : unable to open connection

is there something like environment variables for R?

greetinx jan

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