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SubjectRe: Shell-Script problems


High!

I have checked the things you wrote about that silly script
bahaviours . But -- sorry -- on my linux 2.1.13 it works well.

Do you think, it is possible, that in the area of code of the
kernel, where this all is handled something like an
uninitialized variable or something other, which depends on
that, what happened BEFORE executing the script, play bad
jokes with us? May be a litlle virus called "Bill" which
walks over "golden gates", will turn the kernel into a part
of something very small and unimportant micro software?
(zynic? ME? OH NO! I am only a realistic clown! ;-) ;-) ;-)
;-)

KEEP HACKING!
meino
...who dances with modems...

From POPmail Sun Dec 8 05:00:10 1996
>Date: Sat, 7 Dec 1996 13:31:23 -0700
>From: andersee@et.byu.edu (Erik Andersen)
>To: linux-kernel@vger.rutgers.edu
>Subject: Re: Shell-Script problems
>In-Reply-To: <199612071607.QAA01491@solfire.ludwigsburg.netsurf.de>; from Meino Christian Cramer on Dec 7, 1996 16:07:31 +0000
>
>
>On Dec 7, 1996 16:07:31 +0000, Meino Christian Cramer wrote:
>>
>> High!
>>
>> I've got strange things while trying to execute a shell script...
>>
>
>[----------- snip, snip, snip -----------]
>
>>
>> Because some days ago one mentioned another problem while
>> executing scripts with "!/bin/sh -" (I have got the same problem
>> while executing MAKEDEV), may be this is a error of the same kind?
>>
>
>That was me, and I am STILL having some wierd script problems under 2.1.14.
>The following is taken directly from an xterm running bash under 2.0.27,
>and demonstrates the correct behavior:
>
>andersee@Dillweed% cat scum
>#!/bin/bash
># A useless script named scum
>until [ -e /tmp/foo_does_not_exist ] ;do
> sleep 1
>done
>
>andersee@Dillweed% scum &
>[1] 1027
>andersee@Dillweed% type ps
>ps is aliased to `ps -acux '
>andersee@Dillweed% ps | grep scum
>andersee 1027 0.1 4.1 1396 616 p1 S 12:50 0:00 scum
>andersee@Dillweed% uname -a
>Linux Dillweed 2.0.27 #1 Sun Dec 1 13:06:32 MST 1996 i486
>andersee@Dillweed% touch /tmp/foo_does_not_exist
>[1]+ Done scum
>andersee@Dillweed%
>
>
>This is all correct! No problems at all. But now, I simply reboot into
>kernel 2.1.14 (no other changes whatsoever) and I now get:
>
>
>andersee@Dillweed% scum &
>[1] 282
>andersee@Dillweed% ps | grep scum
>andersee@Dillweed% killall scum
>scum: no process killed
>andersee@Dillweed% touch /tmp/foo_does_not_exist
>[1]+ Done scum
>andersee@Dillweed% uname -a
>Linux Dillweed 2.1.14 #3 Sun Dec 1 17:50:36 MST 1996 i486
>andersee@Dillweed% cat /etc/issue
>Debian GNU/Linux 1.2
>Copyright (C) 1993-1996 Software in the Public Interest, Inc. and others
>andersee@Dillweed% bash -version
>GNU bash, version 1.14.7(1)
>andersee@Dillweed% ldd `which bash`
> libreadline.so.2.0 => /lib/libreadline.so.2.0.1
> libncurses.so.3.0 => /lib/libncurses.so.3.0
> libc.so.5 => /lib/libc.so.5.4.13
>andersee@Dillweed% ps --version
>procps version 1.11
>andersee@Dillweed% ldd `which ps`
> libproc.so.1.11 => /lib/libproc.so.1.11
> libc.so.5 => /lib/libc.so.5.4.13
>andersee@Dillweed% grep -V
>GNU grep version 2.0
>usage: grep [-[[AB] ]<num>] [-[CEFGVchilnqsvwx]] [-[ef]] <expr> [<files...>]
>andersee@Dillweed% ldd `which grep`
> libc.so.5 => /lib/libc.so.5.4.13
>andersee@Dillweed%
>
>
>Something is wrong here. This script does not show up under the ps
>listing. The only change between 2.0.27, where it worked correctly, and
>2.1.14, where the behavior is broken is that I rebooted to load the new
>kernel. If I reboot into 2.0.27, it works again. Please try this script
>using the same version of bash and ps and I believe you will see the same
>error. If I am somehow using an old version of something, please let me
>know. If you don't see something you want, just ask.
>
>This is a live bug, and it seems related to the recent changes in how the
>kernel runs scripts. I sent an earlier post about this, but I was not very
>precise.
>
> -Erik
>
>--
>Erik B. Andersen Web: http://www.et.byu.edu/~andersee/
>2485 South State St. email: andersee@et.byu.edu or andersee@debian.org
>Springville, Ut 84663 phone: (801) 489-1231
>--This message was written using 73% post-consumer electrons--
>
>

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