renice

PROGRAMS1='dd cp mv tar rar gzip gunzip unzip rar bzip2 updatedb ffmpeg oggenc mc deluged revdep-rebuild mkisofs emerge eix-update cc1plus m4 cc1 mount.ntfs-3g convert flac find grep dropbox renice.sh'
# PROGRAMS2='rtorrent'

exec  >/dev/null
exec 2>/dev/null

while true; do
    for p in $PROGRAMS1; do
        for i in $(pidof $p); do
            if [[ $(ps -o nice="" -p $i) != 19 ]]; then
                sudo renice -n 19 -p $i
            fi
            if [[ $(ionice -p $i | awk '{print($3)}') != 7 ]]; then
                sudo ionice -c 2 -n 7 -p $i
            fi
       done
    done
    sleep 20
done