topic Re: Need an explanation in Operating System - HP-UX

Need an explanation

Davor Bira? — Tue, 12 Apr 2005 09:00:53 GMT

I have enconture strange behavior on my server.
It is C3600 with HPUX 11.0.
There is file bla:
pwd
/
ll bla
-rwxrwxrwx 1 root sys 12 Apr 12 15:20 bla
more bla
reboot
root

When I try this command, server shutdowns:
bla = $(cat bla)

There is entry in /var/adm/shutdownlog like this:
15:34 Tue Apr 12, 2005. Reboot: (by root)

There is no core file or something in /var/adm/crash.
Any help?

Re: Need an explanation

RAC_1 — Tue, 12 Apr 2005 09:10:22 GMT

What you do is expected behaviour from bla = $(cat bla)

What do you want??

Anil

Re: Need an explanation

Robert-Jan Goossens_1 — Tue, 12 Apr 2005 09:11:28 GMT

Hi,

Why should there be a crash file?

you did a reboot

bla=$(cat bla)
bla=reboot
reboot

Robert-Jan

Re: Need an explanation

Doug Burton — Tue, 12 Apr 2005 09:15:29 GMT

Yep, you ran "bla" as root I'll bet and rebooted the box. Remove the file "bla".

You may want to look over other files on your server. Wide open perms on home made files could be trouble.

Re: Need an explanation

john korterman — Tue, 12 Apr 2005 09:17:31 GMT

Hi,
maybe you expected that this line should perform a variable assignment, only:
# bla = $(cat bla)
but because of the space after "bla" the shell considers "bla" a separate command to be executed - which it apparently is.

regards,
John K.

Re: Need an explanation

Stephen Keane — Tue, 12 Apr 2005 09:21:17 GMT

It's not generally a good thing to name variables the same as executables! Also the space before the '=' means that the shell interprets your command as

Run executable bla with arguments '=' and '$(cat bla)'

Re: Need an explanation

Geoff Wild — Tue, 12 Apr 2005 09:21:44 GMT

Your substitution is wrong...

$(cat bla) - should be:

BLA=`cat bla`

Then echo $BLA will be:

reboot
root

Rgds...Geoff

Re: Need an explanation

Davor Bira? — Tue, 12 Apr 2005 09:22:55 GMT

Thanks for fast respond, it was really helpfull.