Find 50 most used commands on machine

I am very fond of the history command, and I like to grep old commands from it. Saves me a lot of time. I was wondering what commands i have actually used the most - I found these with the following awk-based script, which will generate a fine list for you:

$ history | awk '{ CMD[$2]++;count++; } END { for ( a in CMD ) print CMD[a] " " CMD[a]/count*100 "% " a; }' | grep -v "./" | column -c3 -s " " -t | sort -nr | nl |  head -n50

Output (2 months old, local machine)

 1    888  17.7636%   ls
 2    732  14.6429%   ssh
 3    480  9.60192%   cd
 4    438  8.76175%   vi
 5    381  7.62152%   dig
 6    227  4.54091%   clear
 7    187  3.74075%   cat
 8    132  2.64053%   python3
 9    91   1.82036%   sudo
10    81   1.62032%   ping
11    74   1.4803%    vagrant
12    74   1.4803%    rm
13    67   1.34027%   git
14    66   1.32026%   curl
15    64   1.28026%   telnet
16    47   0.940188%  mtest
17    45   0.90018%   whois
18    42   0.840168%  brew
19    40   0.80016%   python
20    38   0.760152%  scp
21    36   0.720144%  nc
22    35   0.70014%   p3
23    31   0.620124%  mv
24    31   0.620124%  grep
25    27   0.540108%  netstat
26    27   0.540108%  man
27    24   0.480096%  history
28    23   0.460092%  sass
29    21   0.420084%  bash
30    19   0.380076%  pip
31    19   0.380076%  g++
32    18   0.360072%  vim
33    18   0.360072%  clear;
34    18   0.360072%  awk
35    17   0.340068%  ps
36    17   0.340068%  open
37    16   0.320064%  wget
38    16   0.320064%  chmod
39    15   0.30006%   mkdir
40    11   0.220044%  ifconfig
41    9    0.180036%  tshark
42    9    0.180036%  traceroute
43    8    0.160032%  netcat
44    8    0.160032%  jobs
45    8    0.160032%  htop
46    8    0.160032%  fab
47    8    0.160032%  cp
48    7    0.140028%  pwd
49    7    0.140028%  atom
50    6    0.120024%  top