Fetch all remote git update for your repos in your dev folder recursively

update.rb

#!/usr/bin/ruby

def is_git_repo
  %x[git rev-parse 2>&1]
  $?.exitstatus == 0 
end

dir_to_scan = if ARGV[0]
  if ARGV[0] !~ /^\//
    "#{Dir.pwd}/#{ARGV[0]}" 
  else 
    ARGV[0]
  end  
else
  Dir.pwd
end

repos = Dir.entries(dir_to_scan).select {|f| File.directory? f}

repos.each do |d|
  Dir.chdir "#{dir_to_scan}/#{d}"
  if is_git_repo
    puts "Updating #{d}."
    %x[git remote update]
  end  
end