R help - Apr 1999 - Invoking shell commands from within R

In S-Plus, one can invoke a shell command by prepending it with a "!",
e.g.:

    > !ls

Is something similar available in R?  Is it possible to execute shell
commands from within R?

Fredrik
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>>>>> On 26 Apr 1999 13:46:53 +0200,
>>>>> Fredrik Glockner (FG) wrote:
FG> In S-Plus, one can invoke a shell command by prepending it with a
"!",
FG> e.g.:
>> !ls
FG> Is something similar available in R?  Is it possible to execute shell
FG> commands from within R?

Yes, use the system() command, see help(system)

.f
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   In S-Plus, one can invoke a shell command by prepending it with a
"!",
   e.g.:

       > !ls

   Is something similar available in R?  Is it possible to execute shell
   commands from within R?

   Fredrik
  
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system("ls")

Jonathan


-- 
Dr. Jonathan Myles         e-mail:jonathan.myles at mrc-bsu.cam.ac.uk
MRC Biostatistics Unit     Tel. 01223 330371
Institute of Public Health FAX  01223 330388
University Forvie Site
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CAMBRIDGE
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On 26 Apr 1999, Fredrik Glockner wrote:
> In S-Plus, one can invoke a shell command by prepending it with a
"!",
> e.g.:
> 
>     > !ls
> 
> Is something similar available in R?  Is it possible to execute shell
> commands from within R?
The code to support this is present in main.c.  To compile this in,
place the line

	#define SHELL_ESCAPE

at the top of src/main/main.c.

Using "!" in this way is syntactically ugly and it was a general
decision
to not make this a standard R feature (but I left the code in because I
"knew" someone would ask ...).

	Ross

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