>$ awk '{if(length($1)<20){a[$1]++}} END{for(i in a){print a[i], i}}' .bash_history |sort -n|tail -n 25
324 youtube-viewer
345 mplayer
365 gnuplot
372 echo
386 cp
390 conkeror
417 surf
430 for
486 tmux
505 man
529 zathura
571 tsocks
590 sdcv
625 s
708 "
777 eix
781 less
876 mplayer2
1006 su
1257 ssh
1455 noproxy
1640 l
4202 cd
4262 transmission-remote
5623 lc