My results agree with kennethk's.

It sounds like you are describing egrep, if you have that available to you on your OS: 

$ egrep -v -f file1 file2 > file3

[download]

Update: Since you have not given us enough to reproduce your problem, I recommend that you start sprinkling your code with more print's. Refer to Basic debugging checklist for more details.

In reply to Re: list lines not found in config (while+if) by toolic
in thread list lines not found in config (while+if) by tangledupinperl

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