Redis simple key stats (total size, average size, count keys)

redis_simple_key_stats.sh

#!/usr/bin/env bash

human_size() {
  awk -v sum="$1" 'BEGIN {
    hum[1024^3]="Gb"; 
    hum[1024^2]="Mb"; 
    hum[1024]="Kb"; 
    
    for (x=1024^3; x>=1024; x/=1024) { 
      if (sum>=x) { 
        printf "%.2f %s\n",sum/x,hum[x]; 
        break; 
      } 
    } 
    
    if (sum<1024) 
      printf "%d bytes",sum; 
    }'
}

redis_cmd='redis-cli'

for k in `$redis_cmd keys "*"`; 
do 
  key_size_bytes=`$redis_cmd debug object $k | perl -wpe 's/^.+serializedlength:([\d]+).+$/$1/g'`; 
  size_key_list="$size_key_list$key_size_bytes-$k\n"; 
done

count=0;
total=0;
for l in `echo -e "$size_key_list"` ; do 
    if [[ -n "$l" ]]; then
      count=$(echo $count+1 | bc)

      size=`echo $l | perl -wpe 's/^(\d+).+/$1/g'`; 
      hsize=`human_size "$size"`; 
      key=`echo $l | perl -wpe 's/^\d+(.+)/$1/g' | tr -d "-"`; 
    
      total=$(echo $total+$size | bc)

      #printf "%-10s%s\n" "$hsize" "$key";
    fi 
done 

printf "\nRedisDB Simple Stats\n\n"

printf "%-20s%s\n" "total keys:" "$count"

htotal=`human_size "$total"`
printf "%-20s%s\n" "total size:" "$htotal"

avg=$(echo "scale=2; $total / $count" | bc)
havg=`human_size "$avg"`
printf "%-20s%s\n\n" "avg size:" "$havg";