topic Re: unusual problem with shell scripts in Operating System - HP-UX

unusual problem with shell scripts

amonamon — Fri, 14 Jul 2006 01:18:13 GMT

helloo..

On my solaris I have 2 scripts...one is very simple just init 6

while the other is more complex..

both scripts work just fine but I have some aplication done on my remote windows and I can not execute init 6 script...but other scripts can be executed..any ides??

Re: unusual problem with shell scripts

Peter Godron — Fri, 14 Jul 2006 03:03:54 GMT

Hi,
can you please confirm/clarify:
1. These scripts are on a Solaris platform
2. If they are on a Solaris platform, why do you mention remote windows.
3. You say both scripts work fine, but then that you can not execute the init 6 script.

For point 3.: Have you checked the execute permissions with 'ls -l'

Re: unusual problem with shell scripts

amonamon — Fri, 14 Jul 2006 03:39:43 GMT

right i was confusing..
there are 2 ways to reach those scripts both from windows machine:

1. from emulator like putty both scripts work perfect i can restart machine..

2. using php and telenet class I can execute one script but script with init 6 can not be executed..

PHP code is OK I know that...and in all ways I am root.

Re: unusual problem with shell scripts

Peter Nikitka — Fri, 14 Jul 2006 03:58:42 GMT

Hi,

I'm shure you can tell us the error message, wen you try to execute that script.
'init 6' is a call for reboot, so:
- what is the name of the script calling 'init 6'
- what else is found in that script?

mfG Peter

Re: unusual problem with shell scripts

Ralph Grothe — Fri, 14 Jul 2006 04:21:00 GMT

Since you mentioned PHP,
did I get it right that you want from your remote Windows PC (from a browser?) reboot your Solaris server by an init 6 through some sort of CGI script?
So is there a webserver which is supposed to execute the PHP involved?
For security reasons you wouldn't want the webserver on the Solaris box being run as root.

Re: unusual problem with shell scripts

amonamon — Fri, 14 Jul 2006 04:21:42 GMT

ok I have script restartNode:

#!/bin/ksh

responce="US"
if [ $responce == "US" ]; then
# echo "cao"
# ./restart214
init 6
#shutdown -i6 -g0 -y
echo "has not been created">>kFILE
else
echo "$dir has not been created"
fi

if I execute it via putty it restarts machine..and works perfect..
but with PHP I just can not execute this script all others can be executed..
to be more precised:

script

#!/bin/ksh

responce="US"
if [ $responce == "US" ]; then
# echo "cao"
# ./restart214
# init 6
#shutdown -i6 -g0 -y
echo "has not been created">>kFILE
else
echo "$dir has not been created"
fi

can be executed via PHP
so if I put # before init 6 it works even via PHP(telnet from windows) but if I remove # it does not work..

strange...

Re: unusual problem with shell scripts

Peter Nikitka — Fri, 14 Jul 2006 04:53:01 GMT

Hi,

- try to catch the error
- call init with pathname

#!/bin/ksh
responce="US"

exec 2>/tmp/shutt.err

if [ $responce == "US" ]; then
# echo "cao"
# ./restart214
/usr/sbin/init 6
#shutdown -i6 -g0 -y
echo "has not been created">>kFILE
else
echo "$dir has not been created"
fi

mfG Peter

Re: unusual problem with shell scripts

amonamon — Fri, 14 Jul 2006 05:10:57 GMT

I tryed to catch errors..it creates error file but no errors inside that file..

Re: unusual problem with shell scripts

Peter Nikitka — Fri, 14 Jul 2006 06:28:16 GMT

Hi,

modify script to get traces:

#!/usr/bin/ksh -x
exec 2>/tmp/shutt.err
responce="US"

if [ $responce == "US" ]; then
echo "ciao"
# ./restart214
/usr/sbin/init 6
#shutdown -i6 -g0 -y
echo "has not been created">>kFILE
else
echo "$dir has not been created"
fi

mfG Peter

Re: unusual problem with shell scripts

amonamon — Fri, 14 Jul 2006 07:01:15 GMT

Peter I did that I get empty file errors.err

Re: unusual problem with shell scripts

Peter Nikitka — Fri, 14 Jul 2006 09:34:11 GMT

Hi,

if you really have added the 1st+2nd line of the script to

#!/usr/bin/ksh -x
exec 2>/tmp/shutt.err

and do not get anything then your script must terminate before the next statement. This example

cat /tmp/b
#!/usr/bin/ksh -x
exec 2>/tmp/tstout
a=5

produces this output file:
cat /tmp/tout
+ a=5

Buildup a testscript like

#!/usr/bin/ksh -x
exec 2>/tmp/tstout
echo start >/dev/stderr
/usr/sbin/init 6
echo $?

mfG Peter

Re: unusual problem with shell scripts

Marvin Strong — Fri, 14 Jul 2006 10:04:56 GMT

I thought from left field.
Does init require a valid session to be used? I know it uses pam for session management.

Re: unusual problem with shell scripts

amonamon — Tue, 18 Jul 2006 01:10:41 GMT

hello

I tried what peter told..I got in my shutt.err this:

+ echo has not been created
+ 1>> /opt/tomcat/logs/meme/crFILE
+ init 6

and I executed this:

#!/bin/ksh -x
exec 2>/opt/tomcat/logs/meme/shutt.err

echo "has not been created">>/opt/tomcat/logs/meme/crFILE
init 6

and again solaris is not being restarted..
but again if I execute this script from command line solaris restarts...

can anyone figure what might be my problem...:)

Re: unusual problem with shell scripts

Peter Nikitka — Tue, 18 Jul 2006 02:39:28 GMT

Hi,

as I and you see, you
- do not have entered the full pathname /usr/sbin/init 6
in your script, but only 'init 6'
- you do not have setup the check for the exit-status of that command
- a command 'init 6' gets executed

So try EXACTLY that script and tell us the resulting output.

#!/usr/bin/ksh -x
exec 2>/tmp/tstout
echo start >/dev/stderr
/usr/sbin/init 6
echo $?

mfG Peter

Re: unusual problem with shell scripts

amonamon — Tue, 18 Jul 2006 03:46:01 GMT

Hello...output is:
cat tstout:

+ echo start
+ 1> /dev/stderr
start
+ /usr/sbin/init 6

but still..solaris stays not restarted..:(

Re: unusual problem with shell scripts

Peter Nikitka — Tue, 18 Jul 2006 07:04:58 GMT

Hi,

we see that /usr/sbin/init is called but does not come back again to your script, since no
+ echo NN
is seen in the outout file.

Did the command finish or does it hang at that point?

Best would be not to call a reboot in that way.
Perhaps let an at-job do the work, like

...
echo /usr/sbin/reboot | at now +1 min
...

mfG Peter

PS: My general opinion in case of rebooting is still "do it only when it's necessary and not on a regular base".

Re: unusual problem with shell scripts

amonamon — Tue, 18 Jul 2006 08:11:25 GMT

well..I know but I need restart..so my question is considering that I am new in UNIX can I safely use that reboot command...is there difference between it and init 6??

and just another point..considerin that I am doing all this from my windows mach.on it it is apache and PHP is there maybe some restriction on my apache to prevent restart..I mean is it possible that my apache does not allow remote telnet restart ...I doubt..but..who knows..
Once again can U explain me last command reboot and can I use it..THANKS a lot..

Re: unusual problem with shell scripts

amonamon — Tue, 18 Jul 2006 08:15:26 GMT

echo /usr/sbin/reboot | at now +1 min

can I just enter that in script..together with this: at now +1 min??

Do U think it is safe enough..sorryy again but I am new in solaris..but would love very much to learn..

Re: unusual problem with shell scripts

Peter Godron — Tue, 18 Jul 2006 08:16:25 GMT

Reboot performs a normal orderly reboot, whereas init 6 reboot by terminating all running processes, unmounting all filesystems and rebooting to initdefault in /etc/inittab.
So the orderly shutdown, for example of oracle does not take place with init 6.
See man init and man inittab

Re: unusual problem with shell scripts

amonamon — Tue, 18 Jul 2006 08:36:04 GMT

and one more thing...what would be diff between:

-> shutdown â i6 â g0 -y

-> init 6

-> echo /usr/sbin/reboot | at now +1 min

those "3 restarts"...thanks for explanation..