2 3 4
3 0 7 9
1 5 6 7

store = {} 
all = open("datafile.txt").readlines()
for items in all:
 	key,value = items.split()
  	if store.has_key(key):
 		store[key].append(value)
 	else:
 		store[key] = [value]

for i in sorted(store.keys()):
 	print i, ' '.join(store[i])

1 5 6 7
2 3 4
3 7 0 9

h = Hash.new{[]}
while line = gets
  k,v = line.split
  h[k] <<= v
end
puts h.sort.map{|a| a.join " "}

for i in `awk '{print $1}' file | uniq`
do
        echo $i `grep $i file | awk '{print $2}'`
done

>cat s
1 5
1 6
1 7
2 3
2 4
3 7
3 0
3 9
11 2
11 0

>echo 1 `grep 1 s | awk '{print $2}'`
5 6 7 2 0

for i in `awk '{print $1}' s | uniq`
do
  awk -F" " 'BEGIN{x='$i'} { if( $1=='$i' ) x=x" "$2} END{print x}' s
done

>newoutput
1 5 6 7
2 3 4
3 7 0 9
11 2 0