multiline system call

Look at the help page for ?system, especially the  'input=' arg.

Maybe this sort of strategy will fly:
system("sh",intern=T,input=c("echo x","echo y"))
[1] "x" "y"

In your case, maybe

system('sh' input=c('sendmail -f xxx at swing.be -t yyy at swing.be','test','.')

or

system('sendmail -f xxx at swing.be -t yyy at swing.be', input='test')

will do it.

Hello,

I am trying to call sendmail from within R via system(). As sendmail reads
from STDIN, I need to pass a multiline input as an argument.

E.g. (not working):

	system('sendmail -f xxx at swing.be -t yyy at swing.be\ntest\n.\n')

I tried a lot of ways to type the EOL characters, but cannot get them work the
right way. This leads to several problems. For instance, R waits for me to
enter <control-D> at the end of the sequence.

Thanks for any help.

-- 
Nicolas Mazziotta

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                                          Dept of Family/Preventive Medicine
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multiline system call

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