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/usr/lib/R/site-library/snow/RNWSnode.sh is in r-cran-snow 1:0.4.2-1.

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#! /bin/sh

${RPROG:-R} --vanilla <<EOF > ${OUT:-/dev/null} 2>&1 &

library(nws)
library(snow)

local({
    master <- makeNWSmaster()
    sendData(master, "ping")
    slaveLoop(master)
})
EOF