<b_jonas> slashlearn greater//A greater than sign instructs the shell to send the output of the command to a file. Not very mnemonic, but a grater is the closest thing to a file that ASCII has.

#include <stdio.h>
int main(){printf("\e[1m");int a,c=0;b:a=getchar();if(a==EOF)return 0;if(!(a&128)||(a&64))printf("\e[%dm","\37! $\"#"[c]),c=c+1-6*(c>4);putchar(a);goto b;}