Ruby was my main choice + some command line tools to do bits of extra work, like 'sort' to find the largest palindrome and 'wc' to count the results in last exe

Ruby was my main choice + some command line tools to do bits of extra work, like 'sort' to find the largest palindrome and 'wc' to count the results in last exercise, and even Python command line to just manually sum the primes in second exercise.