Bash fun
pong:
yes $COLUMNS $LINES|awk 'BEGIN{x=y=e=f=1}{if(x==$1||!x){e*=-1};if(y==$2||!y){f*=-1};x+=e;y+=f;printf "\033[%s;%sH",y,x;system("sleep .02")}'
pong:
yes $COLUMNS $LINES|awk 'BEGIN{x=y=e=f=1}{if(x==$1||!x){e*=-1};if(y==$2||!y){f*=-1};x+=e;y+=f;printf "\033[%s;%sH",y,x;system("sleep .02")}'