Randomly choose a command from ls -la, history, du -h, and top and execute it.
awk -F, 'BEGIN {srand();choice=rand()*100;if(choice<=25)com="ls -la";if(choice>25&&choice<=50)com="history";if(choice>50&&choice<=75)com="du -h";if(choice>75)com="top";print com}' | sh;