find_inactive.rb

# install the 't' gem: httjp://sferik.github.io/t/
# set the path to the executable

t_cmd = '~/.rbenv/shims/t'

followings = `#{t_cmd} followings`.split /\s/
whois_cmd = "#{t_cmd} whois "

activity = {}

followings.each do |f|
  info = `#{whois_cmd} #{f}`
  last_active = {f => info.match(/Last update.*\((.*)\)/).captures.first}
  activity.merge! last_active
end

years = activity.select {|k,v| v =~ /years/}
months = activity.select {|k,v| v =~ /months/}
months = months.select {|k,v| v[0,2].to_i > 3}
all_inactive = years.merge(months)

# run t unfollow {output from the command below}
puts all_inactive.keys.join(' ')