Shell Programming and Scripting

Hi everybody!
I'm trying to delete some elements from a list with two elements on each row agreeing with the elements in another list. Pratically I want a perl script able to take each element of the second list (that is a single column list), compare it with both elements of each row from the first list and write only the elements that differ from the single column list elements.
The single column list is a simple list of things like:
id_1
id_2
id_3

The other list is made with thwo elements on the same row separeted by a | and look like:
id_16|id_32
id_2|id_42
id_7|id_99

The result that I wish look like:
id_16|id_32
id_7|id_99


Any help is wished! thank you in advance!!!

Hi.

1) Are these lists really external files on disk or internal perl memory structures -- arrays, hashes, strings, etc.? If files, then why does the solution need to be in perl?

2) What have you tried so far? ... cheers, drl

Why perl? For requirement mentioned in post #1, the following would work (assuming you have the "lists" in two separate files):

Code:

grep -vwf file1 file2

the lists are in two different files. But anyway the code with grep works perfectly! thank you !!!!!! :-)