NetNews Usenet Archive 1992 #27/NN_1992_27.iso/spool/comp/unix/question/13473

Internet Message Format | 1992-11-16 | 1.1 KB

Path: sparky!uunet!ukma!darwin.sura.net!dtix!mimsy!afterlife!adm!news
From: [e-mail] (Hubert Partl)
Newsgroups: comp.unix.questions
Subject: Re: problems with awk: output redirection and getline in a pipe
Message-ID: <[e-mail]>
Date: 16 Nov 92 09:28:57 GMT
Sender: [e-mail]
Lines: 18

> awk 'BEGIN {print "...something"}
>            {print " ...anything for every line"}
>     END    {printf("%2d\n", NR) >"awk.tmp" }' |
> sort |
> awk 'BEGIN {getline < "awk.tmp";
>            numberoflines = $1}
>            {print "---anything for every line"}
>      END   {printf("%2d\n", numberoflines)} '

All three processes of the pipe  "awk | sort | awk"   are running in
parallel, the last awk starts BEFORE the first awk has ended and
therefore reads an old awk.tmp, not the new one.

--
Dr. Hubert Partl                              Mail:  [e-mail]
EDV-Zentrum, Universitaet fuer Bodenkultur    Phone: [phone] - 233
Nussdorfer Laende 11                          Fax:   [phone] - 200
A-1190 Wien, Austria                          (-:  Make laugh, not war!  :-)