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need to check if the process is running

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# 1  
Old 08-18-2011
Question need to check if the process is running
Hi,

I check if the process is running or not using the below.

Code:
 /usr/ucb/ps auxww | grep 10[9]9 |grep rmi |  awk '{print $2}'
9718

Thus we see 9718 is the PID.
It return blank if the process is not running.

I need to perform some action [start the process] if the process is not running and leave it if it is already running.

Can you please help me with the syntax?
# 2  
Old 08-18-2011
Do you try "service --status-all" command?
# 3  
Old 08-18-2011
Error
Nopes I do not have root access and would want to stick to the grep i mentioned in my inaugural post.
# 4  
Old 08-18-2011
Maybe something like this, give it a try:

Code:
#!/usr/bin/ksh
/usr/ucb/ps auxww | grep 10[9]9 |grep rmi 

if [ $? -eq 0 ]
then
pid = `/usr/ucb/ps auxww | grep 10[9]9 |grep rmi| awk '{print $2}'`
echo "process $pid running, doing nothing..."
else
echo "not running..starting process"
<put the command to start process>
fi

This User Gave Thanks to dude2cool For This Post:
shifahim
# 5  
Old 08-18-2011
You don't mention what OS you are running, so here's a start:

Code:
#!/bin/bash
PIDS=$(ps auxww | awk '/(10[9]9)/ || /(rmi)/ {print $2}')
for pid in $PIDS; do
	# Whatever you need to do to start your process.
done

# 6  
Old 08-18-2011
Question
Why so ?

Code:
/usr/ucb/ps auxww | grep onli[n]e0331 | grep rmi
echo $?
1
/usr/ucb/ps auxww | grep onli[n]e0331 | grep rmi | awk '{print $2}'
echo $?
0

I am expecting both of them to return 1 as the process is "Not" running.

Can anyone explain?
# 7  
Old 08-18-2011
awk doesn't know that anything's wrong, and you only get the return value of the last command.

It's traditional to have whatever runs a persistent program save its PID in a file, so you don't need to resort to ps | grep | awk | kitchen | sink tricks to find out what the PID is. This also allows systems where more than one instance of it can be run independently without interfering with each other.
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