Yet another batch mode question

On Mon, 8 Oct 2001, Mark E. Fenner wrote:

Hello all and thanks in advance,

I know you can start R with either:

1.  R CMD BATCH myfile.R

or

2. R < myfile.R

Um, you can't: try it to see the fatal error.

I did forget the "--no-save" or "--vanilla" or "--save" option that is
required for #2 but otherwise:

[mfenner at seneca testForList]$ cat test.R
x <- array(trunc(3*runif(100)), c(10,10))
mean(x)

[mfenner at seneca testForList]$cat results
Script started on Tue Oct  9 09:41:52 2001

[mfenner at seneca testForList]$ R --no-save < test.R
R : Copyright 2001, The R Development Core Team
Version 1.3.1  (2001-08-31)

<snip>

x <- array(trunc(3*runif(100)), c(10,10))

mean(x)

[1] 0.94

[mfenner at seneca testForList]$ R CMD BATCH test.R
[mfenner at seneca testForList]$ more test.Rout

R : Copyright 2001, The R Development Core Team
Version 1.3.1  (2001-08-31)
 
<snip>

invisible(options(echo = TRUE))
x <- array(trunc(3*runif(100)), c(10,10))

mean(x)

[1] 0.8

proc.time()

[1] 1.35 0.09 1.47 0.00 0.00

[mfenner at seneca testForList]$ exit
Script done on Tue Oct  9 09:42:43 2001
[mfenner at seneca testForList]$

In short, they both work for me.  You can supress the echoing of commands
by placing a options(echo = FALSE) type line in your script file.

At present 1 does not pass along further arguments, but sends R method 2
(well, with enough flags to make it work).

If you give 2 further arguments, you will get a strident warning like

auk% R foo
ARGUMENT 'foo' __ignored__

R : Copyright 2001, The R Development Core Team
...

So, do people not use R in this fashion under Unix (as a general
rule)?  That is, running R from the command line with a script and an
input file.

BTW, I am primarily interested in the Unix environment.  Scripting under
Windows raises my blood pressure :) (unless it is in cygwin).

Regards,
Mark

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