ls -l /usr/bin |tail -n +2| awk '{print $5}'

ls -l /usr/bin |tail -n +2| wc -l

ls -l /usr/bin |tail -n +2| awk 'END{print NR}'

ls -l /usr/bin |tail -n +2| awk '{print NR":"$5}'

ls -l /usr/bin |tail -n +2| awk 'BEGIN{sum=0.0}{sum+=$5}END{printf("Average: %f\n",sum/NR)}'

ls -l /usr/bin |tail -n +2| awk -v N=5 '{sum+=$N}END{printf("Average: %f\n",sum/NR)}'

ls -l /usr/bin |tail -n +2| awk -v N=5 \
'{sum+=$N;sumsq+=$N^2}END{printf("Average: %f Std deviation: %f\n",sum/NR,sqrt((sumsq-sum^2/NR)/NR))}'

ls -l /usr/bin |tail -n +2| awk -v N=5 '{print $N}'|sort -n| awk \
'{a[i++]=$1}END{x=int((i+1)/2);if (x < (i+1)/2) y=(a[x-1]+a[x])/2; else y=a[x-1]; printf("Median: %f\n",y)}'

ls -l /usr/bin |tail -n +2| awk -v N=5 \
'{print $N}'|sort -n| awk '{s[NR-1]=$N} END{for(i=0.1;i<=1.0;i+=0.1){printf("%d %f\n",i*100,s[int(NR*i-0.5)])}}'

ls -l /usr/bin |tail -n +2| awk -v N=5 '{print $N}'|sort -n| awk -v DELTA=150000 \
'BEGIN{delta = (DELTA == "" ? 10000 : DELTA)} \
{bucketNr = int(($0+delta) / delta);cnt[bucketNr]++;numBuckets = (numBuckets > bucketNr ? numBuckets : bucketNr)} \
END{for (bucketNr=1; bucketNr<=numBuckets; bucketNr++) {end = beg + delta;printf("%0.1f %0.1f %d\n"), beg, end, cnt[bucketNr];beg = end;}}'>hist.dat

ls -l /usr/bin |tail -n +2| awk -v N=5 '{print $N}'|sort -n| awk -v DELTA=1000 -v MAX=15001  \
'BEGIN{delta = (DELTA == "" ? 10000 : DELTA)} \
{if($0<15001){bucketNr = int(($0+delta) / delta);cnt[bucketNr]++;numBuckets = (numBuckets > bucketNr ? numBuckets : bucketNr)}} \
END{for (bucketNr=1; bucketNr<=numBuckets; bucketNr++) {end = beg + delta;printf "%0.1f %0.1f %d\n", beg, end, cnt[bucketNr];beg = end;}}'>hist.dat

ls -l /usr/bin |tail -n +2| awk -v N=5 '{print $N}'|sort -n| awk -v DELTA=1000 -v MAX=15001  \
'BEGIN{delta = (DELTA == "" ? 10000 : DELTA)} \
{if($0<MAX){bucketNr = int(($0+delta) / delta);cnt[bucketNr]++;numBuckets = (numBuckets > bucketNr ? numBuckets : bucketNr)}} \
END{for (bucketNr=1; bucketNr<=numBuckets; bucketNr++) {end = beg + delta;printf "%0.1f %0.1f %d\n", beg, end, cnt[bucketNr];beg = end;}}' \
|gnuplot -p -e "set terminal dumb size $(tput cols), $(tput lines) enhanced; set autoscale;set style data histogram;set style fill solid;plot '-' using 3:xtic(1)"

ls -l /usr/bin |tail -n +2| awk -v N=5 \
'{if($9 ~ /^m/){sum+=$N;sumsq+=$N^2;count++}} \
END{printf("Average: %f Std deviation: %f Count: %d\n",sum/count,sqrt((sumsq-sum^2/count)/count),count)}'

ls -l /usr/bin |tail -n +2| awk -v N=5 \
'{IGNORECASE = 1;if($9 ~ /^m/){sum+=$N;sumsq+=$N^2;count++}} \
END{printf("Average: %f Std deviation: %f Count: %d\n",sum/count,sqrt((sumsq-sum^2/count)/count),count)}'

ls -l /usr/bin |tail -n +2| awk -v N=5 \
'IGNORECASE = 1 && $9 ~ /^m/{sum+=$N;sumsq+=$N^2;count++} \
END{printf("Average: %f Std deviation: %f Count: %d\n",sum/count,sqrt((sumsq-sum^2/count)/count),count)}'

ls -l /usr/bin |tail -n +2| awk -v N=5 \
'{if(NR >9 && NR<21){sum+=$N;sumsq+=$N^2;count++}} \
END{printf("Average: %f Std deviation: %f Count: %d\n",sum/count,sqrt((sumsq-sum^2/count)/count),count)}'

ls -l /usr/bin |tail -n +2| awk -v N=5 \
'(NR >9 && NR<21){sum+=$N;sumsq+=$N^2;count++} \
END{printf("Average: %f Std deviation: %f Count: %d\n",sum/count,sqrt((sumsq-sum^2/count)/count),count)}'

ls -lt --time-style=long-iso /usr/bin|awk -v date=2020-06-09 'date<$6{print $8}'

func round(n)
{
  return int(n+0.5)
}

function ceil(n)
{
  return n%1 ? int(n)+1 : n
}