topic Re: Script run on another shell in Operating System - HP-UX

Script run on another shell

Fernando Boza — Tue, 05 May 2009 16:07:40 GMT

I have a cluster serviceguard with HP-UX 11.11 and Sybase.

I have a script to start the database whit those lines:

su - sybase -c "/sybase/ASE-12_5/install/startserver -f /sybase/ASE-12_5/install/RUN_SYBASE"
echo "BASE INICIADA"

But.... the messages "BASE INICIADA" appears before base started.

Any idea?

Re: Script run on another shell

Steven E. Protter — Tue, 05 May 2009 16:15:57 GMT

Shalom,

Control the shell the script runs with the top line of the script.

#!/bin/ksh
# Whatever you want.

SEP

Re: Script run on another shell

TTr — Tue, 05 May 2009 18:20:02 GMT

I can not test it right now but the "startserver" is a binary that detaches from the shell and runs in the background. So the execution continues immediately with the "echo" line while the startserver still running in the background and starts the databases. You can try puting the "echo" inside the "su -c" command as in
"su - sybase -c "/sybase/ASE-12_5/install/startserver -f /sybase/ASE-12_5/install/RUN_SYBASE; echo 'BASE INICIADA'
" but I don't think it will help.

Re: Script run on another shell

Basheer_2 — Wed, 06 May 2009 05:08:58 GMT

I think this is wahts happening. your startserver script runs in background. it forks a process and then does echo "BASE INICIADA" doesn't wait for the completion of startserver.

you can do this to avoid. change the above line to look like this

su - sybase -c "/sybase/ASE-12_5/install/startserver -f /sybase/ASE-12_5/install/RUN_SYBASE" && echo "BASE INICIADA"

i.e if the startserver scripts runs successfully then do the echo

Re: Script run on another shell

Suraj K Sankari — Wed, 06 May 2009 05:27:18 GMT

Hi,

Put this in one line with ";" seperator

su - sybase -c "/sybase/ASE-12_5/install/startserver -f /sybase/ASE-12_5/install/RUN_SYBASE";echo "BASE INICIADA"

Suraj

Re: Script run on another shell

Dennis Handly — Wed, 06 May 2009 05:41:11 GMT

>Suraj: Put this in one line with ";" separator
su - sybase -c "/sybase/ASE-12_5/install/startserver \
-f /sybase/ASE-12_5/install/RUN_SYBASE"; echo "BASE INICIADA"

I don't see how this is any different, than separate su then echo.

I suppose you could do both under that su but that won't be different, other than which shell does the echo.

Re: Script run on another shell

Suraj K Sankari — Wed, 06 May 2009 06:09:01 GMT

Hi Dennis,

If I give command saperater between 2 commands for example #ls;cat abc

cat abc will run after compleated the 1st command right if this is ok then in above also right 1st it will run the su then it will run echo.

Suraj

Re: Script run on another shell

Dennis Handly — Wed, 06 May 2009 06:49:25 GMT

>Suraj: If I give command separator between 2 commands for example #ls; cat abc

There is no difference here between ";" and a newline.

>it will run the su then it will run echo.

Yes, they are done in order but there is another process involved. Since the author said it didn't work, and TTr mentioned "background" the ";" won't help.

Re: Script run on another shell

Peter Nikitka — Wed, 06 May 2009 07:10:03 GMT

Hi,

having a program which puts its execution in background requires an extra monitoring to get the exit status or completion of the background part.

At first try
- measure the time until a connection to the DB succeeds
- write a monitor script which ...
- sleeps that time + some factor
- tries to connect to the DB
- reports the availability of the DB

@Suraj: Your statement is incorrect:
>> #ls;cat abc

>> cat abc will run after compleated the 1st command right
>> if this is ok then in above also right
>> 1st it will run the su then it will run echo.

- You'd have to use
ls && cat abc
to do this. Yours would execute the 'cat' whether the 'ls' succeeds or not.

mfG Peter

Re: Script run on another shell

Bart Paulusse — Wed, 06 May 2009 07:13:58 GMT

Have your script check the startserver process and perform the
echo "BASE INICIADA" after that process is no longer in the processlist.
But... If for some reason the startup of your database fails, you'll still get the "BASE INICIADA" message as if everything is ok.

You say startserver is a binary. How about RUN_SYBASE, if that is a script, you can create your own version of that script and let it mail you upon completion. You could even check for return codes and report a more meaningfull message.

Regards,
Bart