look at this
$SORT is sort -S 512m
$tmp2 is input filename (being 2GB size), $tmp3 is output
this fragment tries (with success) to randomize lines from $tmp2 and write
it to $tmp3
while read ll;do
echo $RANDOM $RANDOM $ll
done <$tmp2 | $SORT |cut -f 3- -d " " >$tmp3
this works but why bash sucks VM space?
69274 test 1 -8 0 1862M 98008K pipewr 1 8:17 40.28% bash
this 1862 is growing until it finishes, resident size is 100M because it
gets swapped out.
it looks like echo'ed data is kept in bash memory
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