Re: awk or sed?

[Santiago Vila Doncel <sanvila@unex.es>]

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A. M. Varon wrote:
> I have two files say, file1 and file2
> 
> file1 contains:            file2 contains:
> alpha                      alpha                    
> bravo
> charlie
> 
> What I want to do is compare the two files, and delete the contents of
> file1 according to file2. So, from the above, I'll have to delete the word
> alpha from file1. Can it be possible using sed? or awk?

If you do not want to worry about regexps, you may try this gawk script:

#!/usr/bin/gawk -f
{
  if (ARGIND == 1)
    a[$0] = 1
  else if (! ($0 in a))
    print $0
}

and then do:    exclude.gawk file2 file1 > new.file1

(It has to be gawk because mawk has not ARGIND, I'm afraid, but maybe
there are some way to rewrite this for general awk).

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