in reply to Filtering lines from one file from another

Another non-Perl solution would be the Unix command "comm"
comm -23 file1 file2 would do it.
I like comm because you can get lines in file1 and not in 2, in 2 and not in 1 and lines common to both.

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Re^2: Filtering lines from one file from another
by Limbic~Region (Chancellor) on Feb 03, 2011 at 16:16 UTC
    The problem with comm is that it requires the files to be sorted (which they are not). If antonn doesn't need to preserve order than this is a fine solution. It is actually a fairly difficult problem to solve if you self-impose a number of constraints such as order preservation and arbitrarily large files.

    Cheers - L~R