Shell Programming and Scripting

> cat f1
a b 1
c d 3
e f 0
f b 4
h h 0
x y 5

f d 1
h h 0 
f b 4
e f 2
c d 3
a b 1
y x 5

> Desired output
a b 1 a b 1
c d 3 c d 3
e f 0 e f 2
h h 0 h h 0
f b 4 f b 4

awk 'NR==FNR{A[$1,$2]=$0;next} A[$1,$2]{print $0,A[$1,$2]}' f2 f1

 awk 'NR==FNR{A[$1,$2]=$0;next}
        {if(A[$1,$2])
             {print $0,A[$1,$2];delete A[$1,$2]}
          else print>ARGV[2]".nomatch"
        }
        END{for(i in A)if(A[i])print A[i]>ARGV[1]".nomatch"}' f2 f1

> f3
> f1.notf2
cat f1   |   while read a b c
do
        data=$(grep "^$a $b "   f2    2>/dev/null    )
        [ "$data" != "" ] && echo "$a $b $c $data"    >> f3
        [ "$data" = "" ] && echo "$a $b $c "    >> f1.notf2
done

$ cat f1
a b 1
c d 2
e f 3

$ cat f2
e f 3
a b 1
g h 1

$ source awk.csh
a b 1 a b 1
e f 3  e f 3

ls -l *.nomatch