Shell Programming and Scripting

I'm looking to compare two delimited files:

one|xxx
two|xxx
three|xxx

four|xxx
five|xxx
six|xxx
one|yyy

Where the result is the the file2 row whose first field does NOT appear in file1. I.e., the correct result would be:

four|xxx
five|xxx
six|xxx

I was using this piece of awk as a starting point that does what I want except it prints the rows from file2 that DO match:

Code:

 
awk -F'|' 'NR==FNR{++a[$1];next} $1 in a'  file1 file2

I'm hoping to reverse this logic will require a minor tweak of this awk line, but I can't seem to come up with it.

Any suggestions appreciated!

Thanks,
Al

Code:

awk -F'|' 'NR==FNR{++a[$1];next} ! ($1 in a)'

You were right about the minor tweak

Code:

awk -F'|' 'NR==FNR{++a[$1];next} !($1 in a)' file1 file2

Thanks very much folks!