There's an instance of ``uniq -D'' in the mail command as well that John hat
trouble with. I thought about replacing it with something like:
comm -3 <(printf "%s\n" "[EMAIL PROTECTED]") \
<(printf "%s\n" "[EMAIL PROTECTED]" \
| uniq -f1 -u) \
| cut -f1
that would add a dependency on comm, but that should be there as it's POSIX.
<(...) also isn't portable enough though, so that would have to be replaced
by tempfiles, too ... quite ugly.
Also, I don't know how to produce a RFC822 timestamp with POSIX date; no idea
how to produce a timezone offset (e.g., +0100, -0600):
$ date --rfc-822
Mon, 30 Jan 2006 23:52:43 +0100
$ date '+%a, %d %b %Y %H:%M:%S xxxxx'
Mon, 30 Jan 2006 23:52:44 xxxxx
Andreas
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