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while [ condition ]
do
...
done
ps -ef | grep process | awk '{ print $2}' could be shorten
& could save a pipe :

ps -ef | awk '/process/{ print $2}'

Me too.
After a cleanup of a full 40 Gb NTFS drive down to 60% full I've had the M$ Windows XP defrag take 30 hours despite having 2 Gb memory fitted. After that the system ran normally.
...