Dennis,
PS1 is an internal shell environment variable (modifying prompt) which has
nohting to do with R (and nothing to do with the computer name by default) so
it won't be set in R, only in a shell.
If you want the machine's hostname you'd typically use system("hostname") in R.
Cheers,
Simon
> On 26/05/2023, at 17:15, Dennis Fisher <[email protected]> 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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