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Flexible load detection without needle dependency:

limit=0.1; while true; do read load dummy < /proc/loadavg  ; idle=`echo "$load < $limit" | bc -l` ; echo $load $idle ; test $idle = 1 && break ; sleep 1 ; done

this way we loose the nice top in the video to see what is going on in the 30-90 seconds. But we can integrate top in the loop as

limit=0.1; while true; do read load dummy < /proc/loadavg  ; idle=`echo "$load < $limit" | bc -l` ; top -n1 -b| head -n30 ; test $idle = 1 && break ; sleep 1 ; done