Re: [Help-bash] unmatched

[Patrick Hess]

On 04.09.2016 00:57, Val Krem wrote:
> awk  'NR==FNR{c[$1]++;next};c[$2] >0' file1 file2
>
> Is it possible to get the negative of this teh above line? i.e., to get the 
> unmatched lines

There might be more elegant and/or readable solutions to this task,
but taking your awk script as a starting point, this should give
you the result you want:

    awk 'NR == FNR { c[$1]++; next }   \
         $1 ~ /^[0-9]+/ && c[$2] == 0' \
        file1 file2

"$1 ~ /^[0-9]+/" will get rid of file2's header, including the blank
line that follows it, and "c[$2] == 0" will be true for any number in
the second column of file2 that had not been inserted into the array
when processing file1.

Patrick

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