Kjetil brinchmann Halvorsen: > > This si my shell (bash) script: > > # shell script to install all the packages in ~/R/allpackages, > # to ~/R/allinstall . Should be run from ~/R/Recommend . > # > for FILE in ~/R/allpackages/*z > do > if [ -f $FILE ] > then > nice R CMD INSTALL --library=~/R/allinstall --no-test-load \ > --no-configure --html --no-libs --no-exec --resave-data $FILE \ > || echo "Problems encountered during processing of $FILE" &
The ampersand (&) at the end of the previous line sends the nice'd
process to the background. The loop continues immediately after the
command is started, so within a few seconds you have as many 'CMD'
processes as you have files matching ~/R/allpackages/*z.
> Any tips on how to write the script so that it becomes "nice"?
Just remove the ampersand. Alternatively, if you want to run a few
processes in parallel to use multiple cores, you can replace the whole
loop with a find … | xargs construct. See xargs' -P option.
J.
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