Shell Programming and Scripting

field1 field2 field3 field4 field5 field6
id1    carrot  white small  
id2    carrot
id3    potato  black
id4    potato

field1 field2 field3 field4 field5 field6
num1 carrot  white  small tasty xxx
num2 carrot  black  big     bad  yyy
num3 potato  yellow large   good  zzzz
num4 potato  black   small bad  aaaa
num5 potato  green   medium nasty bbbb
num6 carrot  white   big     good   cccc

field1 field2 field3 field4 field5 field6 fieldx fieldy
num1 carrot  white  small tasty xxx  id1 id2 
num2 carrot  black  big     bad  yyy id2 
num3 potato  yellow large   good  zzzz id4
num4 potato  black   small bad  aaaa id3 id4
num5 potato  green   medium nasty bbbb id4
num6 carrot  white   big     good   cccc id2

> while read line
> do
> awk '{$1=""; print $0}' $line > $line.1
> grep $line.1 file2 | awk '{print $1}' > $line.otu_id
> awk '{print $line "\t" $line.otu_id}' >> file3
> done < file1