[R-SIG-Mac] Identifying computer from R

[Iris Simmons]

Hi,


I think PS1 is generally a bash environment variable. So if you're not
opening your R session from a bash session, then PS1 is likely undefined.

You could perhaps use `Sys.info()` instead if you wish to determine which
computer of yours is running the code.

On Fri, May 26, 2023 at 6:15 PM Dennis Fisher <fisher using plessthan.com> wrote:

> R 4.2.3
> OS X
>
> Colleagues
>
> Interesting (minor) problem.  I have code that I run automatically on two
> different computers.  The code runs from Dropbox so there is not separate
> code for each computer.
>
> In order to identify which computer is running the code, I was hoping to
> do something like:
>         Sys.getenv(SOMETHING)
>
> In a terminal window:
>         echo $PS1
> returns the prompt on that particular computer.
>
> However, when I attempt to access that from R, I am not successful.  For
> example:
>
> In a terminal:
>         echo $PS1
> returns:
>         PET\!>
>
> In R:
>         Sys.getenv("PS1")
> returns:
>         ""
>
> In R:
>         system("echo $PS1")
> returns an empty line.
>
> A solution to this immediate problem (how to obtain that environment
> variable in R) or any other clever way to identify a particular computer
> would be much appreciated.
>
> Dennis
>
>
> Dennis Fisher MD
> P < (The "P Less Than" Company)
> Phone / Fax: 1-866-PLessThan (1-866-753-7784)
> www.PLessThan.com
>
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