On 02.06.2023 09:05, Martin Maechler wrote:
Simon Urbanek
on Mon, 29 May 2023 07:36:46 -0500 writes:
> 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.
Or Sys.info()[["nodename"]]
Even Microsoft provides 'hostname', hence I believe this is pretty save
to use. But then the result is not identical:
c(Sys.getenv("COMPUTERNAME"), Sys.info()[["nodename"]],
system("hostname", intern=TRUE))
[1] "CRANWIN3" "CRANWIN3" "CRANwin3"
Where the GUI agrees with the system("hostname") version and what I
defined when setting up the machine.
Note that the nodename in the network is not case sensitive, hence it is
right, too.
Conclusion: Which version is preferred depends on the actual task.
Best,
Uwe
which I think should be slightly more portable, no?
Best,
Martin
> Cheers,
> Simon
>> On 26/05/2023, at 17:15, Dennis Fisher <fis...@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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>> R-SIG-Mac@r-project.org
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>>
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