Wirt wrtes:
> Paul writes:
>
> > However, Jeff's suggestion, while it eliminates superfluous processes,
will
> >  NOT "solve" Allen's original request of producing a list of "unmatched"
> >  records.
>
> That's true. The process Allen requested is going to intrinsically require
> some sort of set subtraction. The processes that have been mentioned up to
> now in POSIX have only been doing set unioning.

Not my solution.  "join -v" does a difference, as would "comm -23",

sort -t '|' master >master.sorted
sort -t '|' newfile >newfile.sorted
join -t '|' -v 1 newfile.sorted master.sorted >nomatch

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