topic Re: Linux - How to trace login procedure in Operating System - Linux

Linux - How to trace login procedure

Raynald Boucher — Wed, 02 May 2007 09:17:03 GMT

Hello all,

I'm experimenting a problem with the login procedure for a user.
When I log on interactively as user Joe on a Linux server, his environment (ie work, home log and temp directories) is set properly and the subject job executes properly.
When I submit the same job from an Autosys server, the job fails due mostly to an incorrect environment (generating infut file not found).

I have modified the job to display userid and all system variables but that only provides the end result and not how/why the error happened.

I try modifying /etc/profile to use "set -x" and "script" to an output file but that only gave me a zero length log.

How can I trace the logon process?
I mean see which login scripts were executed and a detail log of each command?

Thanks
Rayb

Re: Linux - How to trace login procedure

Steven E. Protter — Wed, 02 May 2007 09:39:04 GMT

Shalom Rayb,

Two ideas.

set -x in the .bash_profile or whatever is being executed. env > file in the profile or startup script.

At login, find out the process id and use strace to track the process in detail. See the man page for strace to see about hanging it on a process in a script.

SEP

Re: Linux - How to trace login procedure

Ivan Ferreira — Wed, 02 May 2007 11:59:16 GMT

Try modifying the job to source the /etc/profile, the .bashrc and .bash_profile files, for example:

source /etc/profile
source ~/.bash_profile

Re: Linux - How to trace login procedure

Marco A. — Wed, 02 May 2007 13:28:47 GMT

You can start your "session" and then try to login that user, then use the tusc application to trace what is doing ...
#tusc

Try that and let us know your results.

Best regards,

Marc0