Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!husc6!rice!sun-spots-request
From: keith%tira@gargoyle.uchicago.edu (Keith Waclena)
Newsgroups: comp.sys.sun
Subject: Possible bug in SunOS Release 4 Bourne Shell?
Keywords: SunOS
Message-ID: <763@brazos.Rice.edu>
Date: 4 Aug 89 22:21:42 GMT
Sender: root@rice.edu
Organization: Sun-Spots
Lines: 48
Approved: Sun-Spots@rice.edu
X-Sun-Spots-Digest: Volume 8, Issue 93, message 13 of 16

Hardware: Sun 4/110, Sun 3/50
OS:	  SunOS 4.0, SunOS 4.0.1

The following shell script gives different results when invoked with
standard input redirected from a file, compared to when the same file is
piped into it via cat.

    $ cat testread.sh
    #!/bin/sh

    read FIRSTLINE
    read SECONDLINE
    (echo "$FIRSTLINE"; echo "$SECONDLINE"; cat)
    $ cat FOO
    AAA
    BBB
    CCC
    $ cat FOO | /bin/sh testread.sh
    AAA
    BBB
    CCC
    $ /bin/sh testread.sh <FOO
    AAA
    BBB
    AAA
    BBB
    CCC
    $

(This problem showed up in a realistic context; testread.sh is the
smallest script I can write that illustrates the problem.)

The script works (i.e., produces the same output regardless of whether the
input comes from redirection or from a pipe) under the following standard
Bourne shells: on a Sun 3/50 running SunOS 3.4, on an Elxsi running their
version of Unix, and on an AT&T 3B15 running System V r2.

Is this a known bug?  Does it exist in the latest version of SunOS?
(We're upgrading soon.) 

Thanks for the info,

						Keith

--
Keith WACLENA                             keith@curry.uchicago.edu
GLS / TIRA / U of Chicago                 keith%curry@uchimvs1.bitnet
1100 E.57th.St Chi IL 60637 USA           ...!uunet!curry.uchicago.edu!keith