Shell Programming and Scripting

Hello,
i have written a mail previously but now i have written a script to monitor the status of the unix system process,in which i redirect the out put to file now i have a problem filtering the process that are running and stopped. in fact i want to filter for the processes that have stoped and send the list via mail. ( i can manage the ma
can some one help me on this

below is code, if some one can suggest me some better method i would be very thakful

#!/bin/ksh
# Korn shell script
rm /tmp/psout.txt
ps -efl > /tmp/psout.txt


sample out put:
F S UID PID PPID C PRI NI ADDR SZ WCHAN STIME TTY TIME CMD
19 T root 0 0 0 0 SY ? 0 Mar 14 console 0:01 sched
8 S root 1 0 0 41 20 ? 102 ? Mar 14 console 3:31 /etc/init -
19 S root 2 0 0 0 SY ? 0 ? Mar 14 console 0:00 pageout
19 S root 3 0 1 0 SY ? 0 ? Mar 14 console 287:46 fsflush

Do you want to check if a particular process is running? If yes, then you can directly run:

Code:

ps -ef |grep "process_name" > /dev/null 2>&1
echo $?

If the output of echo is 0, then the process is running, else if it is 1, then the process is not running.

Then you can take the appropriate action as per your requirements.

If you are just looking for the return, I'd use 'pgrep' instead of piping ps to grep. You can still use blowtorch's suggestion to check the return, but it is a little more efficent and will always ignore the calling process as shown below:

$ time pgrep ttymon
355
8328

real 0m0.03s
user 0m0.00s
sys 0m0.03s
$ time ps -ef | grep ttymon
root 355 345 0 Feb 14 ? 0:00 /usr/lib/saf/ttymon
root 8328 1 0 Feb 15 console 0:00 /usr/lib/saf/ttymon -g -h -p tweety console login: -T sun -d /dev/console -l c
kduffin 11767 11458 0 08:55:24 pts/12 0:00 grep ttymon

real 0m0.12s
user 0m0.07s
sys 0m0.05s

Cheers,

Keith

guys,
Thanks for you intrest in helping me, but what i'm looking is to notify me all the system as well as user processes that have stopped on that perticular system. so that we can restart and get my work going.
we have some application , webserver which stops working cause the http or db services get aborted or stoped unknowingly. this stoped or aborted process have to be notified.
Kindly let me know if my query is clear or not.

Regards,
Pradeep Kulkarni

Thats what we are helping you with.

As Keith says, you can use pgrep (or grep) to check if a particular process is running or not. I will give you an example.

To check if the webserver is up or not - check for daemon httpd.

Code:

ps -ef | grep httpd | grep -v grep
if [ $? -ne 0 ]; then
    <do your notification stuff here - mail or whatever>
fi

Is this clearer? In this way, you can check for whatever processes that are required to be running. Also, you can put this in cron so that this will run say every 5 min (or whatever interval that you want).

Cheers

Hello blowtorch,
I agree with you and thanks for you reply, but one problem that i have is, i have such mamy process and for that i need to write this piece of code for each and every process, which does not sound good. hence i was trying to find some simpler way where i get information about all stoped processes and not grep for a perticular process. as i need to use this script in the cron.

can you help me on this.

Thanks
pradeep

There is no way really that you could check for a process that is no longer running. The best (and only?) way is to check if a process is running and act if it is not.

I have a suggestion for you. Make a list of all processes that you want running. i.e httpd, sshd, inetd, whatever.. and put them in a file; say proc_check.txt and store it in a secure directory such as /root.

Use the following code in a script that will execute from root crontab.

Code:

while read proc_name; do
   ps -ef | grep $proc_name | grep -v grep > /dev/null 2>&1
   if [ $? -ne 0 ] ; then
      <do the notification stuff here>
   fi
done < /root/proc_check.txt

Even if you have a very large number of processes to check for, the list creation will be a one time job. And you can always add/delete processes from the list as per your requirements.