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Full Discussion: How to choose the RIGHT PID?
Top Forums UNIX for Dummies Questions & Answers How to choose the RIGHT PID? Post 302842133 by Igrok on Thursday 8th of August 2013 01:12:57 PM
Old 08-08-2013
How to choose the RIGHT PID?
I can find a single PID and copy it to a variable (thanks to the forum), but I have a slightly tougher situation:

When a user logs into our system, it creates 5 processes

example:
Code:
root     21160  3096  0 07:16 ?        00:00:00 sshd: cs113 [priv]
cs113    21164 21160  0 07:16 ?        00:00:00 sshd: cs113@pts/23
cs113    21165 21164  0 07:16 pts/23   00:00:00 -bash
cs113    21186 21165  0 07:16 pts/23   00:00:00 -bash
cs113    21195 21186  0 07:16 pts/23   00:00:01 rtssyn SYNDRV CS

Sometimes, the user gets logged in multiple times and the system won't let them back in. I want to write a script to identify the PIDs of the user and kill them, so they can log back into the system. To do this currently, I am manually grepping for the PIDS using:

Code:
ps -ef | grep cs113

and I get the result posted in the example. I then proceed to kill the process for cs113 that is owned by root to kill the user's login. example from above:

Code:
kill 21160

Depending on how many logins are in the system, I have to manually kill multiple PIDs.

Again, is there a way to automate the process?
Last edited by Scott; 08-08-2013 at 02:18 PM.. Reason: Please use code tags
 

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LEARN ABOUT MOJAVE

kill.d

kill.d(1m)							   USER COMMANDS							kill.d(1m)

NAME

       kill.d - snoop process signals as they occur. Uses DTrace.

SYNOPSIS

       kill.d

DESCRIPTION

       kill.d is a simple DTrace program to print details of process signals as they are sent, such as the PID source and destination, signal num-
       ber and result.

       This program can be used to determine which process is sending signals to which other process.

       Since this uses DTrace, only users with root privileges can run this command.

EXAMPLES

       Default output, print process signals as they are sent.
	      # kill.d

FIELDS

       FROM   source PID

       COMMAND
	      source command name

       TO     destination PID

       SIG    destination signal ("9" for a kill -9)

       RESULT result of signal (-1 is for failure)

DOCUMENTATION

       See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver-
       bose descriptions explaining the output.

EXIT

       kill.d will run forever until Ctrl-C is hit.

AUTHOR

       Brendan Gregg [Sydney, Australia]

SEE ALSO

       dtrace(1M), truss(1)

version 0.90							   May 14, 2005 							kill.d(1m)
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