for i in `seq 1 1000000` do echo $i >> count.dat doneexport n=500000 export m=500100time sed -n -e "$n,${m}p" -e "${m}q" count.dat > bbb.dat real 0m0.059s user 0m0.056s sys 0m0.004stime head -$m count.dat |tail -100 > aaa.dat real 0m0.046s…