On my work computer (I'm a webdev):

     1	101  20.2%  vim
     2	64   12.8%  gs
     3	56   11.2%  cd
     4	49   9.8%   git
     5	40   8%     ls
     6	30   6%     ga
     7	20   4%     grep
     8	20   4%     gcm
     9	20   4%     brake
    10	14   2.8%   gpso

`git` actually is a much higher percentage, since `gs`, `ga`, `gcm`, and `gpso` are aliases for various git commands.