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Full Discussion: Find a process ID,kill it and restart agent
Operating Systems Linux Find a process ID,kill it and restart agent Post 302953394 by samrat dutta on Thursday 27th of August 2015 04:02:23 PM
Old 08-27-2015
Find a process ID,kill it and restart agent
Code:
#!/bin/bash
#This shell finds the pid of the hawkagent and kills and restarts to put the rulebase into effect
output=`ps aux|grep hawkagent`
#The set -- below helps to parse the above ps output into words and $2 gives the 2nd word which is pid
set -- $output
pid=$2
#Checks if pid of hawkagent exists then kills else starts the hawkagent and exits the program
if [[ $? -eq 0 ]]
then
{
        echo "Kill and start hawkagent if present"
        echo $pid
        kill $pid
        #Wait for 2 seconds for hawkagent to be killed else kill it forcefully if it still exists
        sleep 2
        kill -9 $pid > /dev/null 2>&1
        #Start the hawk agent after killing the existing pid
        nohup ./hawkagent_BWQA &
}
else
{
        echo "Start hawkagent if not present"
        #Start the hawk agent if the hawkagent is not available and exits the program
        nohup ./hawkagent_BWQA &
};
fi
exit

Objctive of the above process is to find a process-id and kill it and then restarts the agent again.
I have below 2 scenarios :
(a) If condition - works when a processID is already present and the process ID is killed and then the agent is restarted using following command :
Code:
nohup ./hawkagent_BWQA &

.
(b) Else condition- when the agent is not present then there is no processID. So this else part starts the agent and should exit.
However in this scenario the else part is not working . I believe my below if condition is not working properly
Code:
if [[ $? -eq 0 ]]

.
Any thoughts or suggestions is appreciated .
 

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LEARN ABOUT BSD

kill

KILL(1) 						      General Commands Manual							   KILL(1)

NAME

       kill - terminate a process with extreme prejudice

SYNOPSIS

       kill [ -sig ] processid ...
       kill -l

DESCRIPTION

       Kill  sends the TERM (terminate, 15) signal to the specified processes.	If a signal name or number preceded by `-' is given as first argu-
       ment, that signal is sent instead of terminate (see sigvec(2)).	 The  signal  names  are  listed  by  `kill  -l',  and	are  as  given	in
       /usr/include/signal.h, stripped of the common SIG prefix.

       The  terminate  signal  will  kill  processes  that do not catch the signal; `kill -9 ...' is a sure kill, as the KILL (9) signal cannot be
       caught.	By convention, if process number 0 is specified, all members in the process group  (i.e.  processes  resulting	from  the  current
       login)  are  signaled  (but  beware:  this works only if you use sh(1); not if you use csh(1).)	Negative process numbers also have special
       meanings; see kill(2) for details.

       The killed processes must belong to the current user unless he is the super-user.

       The process number of an asynchronous process started with `&' is reported by the shell.  Process numbers can also be found by using ps(1).
       Kill  is  a  built-in  to  csh(1); it allows job specifiers of the form ``%...'' as arguments so process id's are not as often used as kill
       arguments.  See csh(1) for details.

SEE ALSO

       csh(1), ps(1), kill(2), sigvec(2)

BUGS

       A replacement for ``kill 0'' for csh(1) users should be provided.

4th Berkeley Distribution					  April 20, 1986							   KILL(1)
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