Getting process ID in a shell script.

haroon_a · #1 (**permalink**) 2 Weeks Ago

Hi all,

In my script i need to store the process ID of my app server in a variable. I know how to verify whether a process is running, by following:

Code:

 
ps -ef|grep 'jboss'
status=$?
 
if [ "$status" = 0] ; then
   # process is running
else
   # process is nor running
fi

But what I need here to get the process ID of jboss, if its running.

Can someone please advise, how can I get the process ID?

Thanks in advance.

scottn · #2 (**permalink**) 2 Weeks Ago

Code:


PID=$(ps -eo pid,comm | awk '$2 == "jboss" {print $1}')

if [ -z "$PID" ]; then
  ... not running
else
  ... running
fi

Assumes you have just one jboss process running.

haroon_a · #3 (**permalink**) 2 Weeks Ago

Thanks Scott, for quick reply,

Here's what I have in my script:

Code:

#!/bin/sh
. ~/.profile



PID=$(ps -eo pid,comm | awk '$2 == "jboss" {print $1}')

echo $PID

if [ -z "$PID" ]; then
  echo "... not running"
else
  echo "... running"
fi

and I my jboss process is running... i.e.

Code:

haroon_a 544950 659604   1   Nov 02      -  8:30 /app/jboss4.2.0/jdk/bin/java -Dprogram.name=run.sh -server -Xms1024m -Xmx1500m -XX:PermSize=64m -XX:MaxPermSize=256m -Xss512k -XX:+HeapDumpOnOutOfMemory -XX:+DisableExplicitGC -Dsun.rmi.dgc.client.gcInterval=3600000 -Dsun.rmi.dgc.server.gcInterval=3600000 -Djava.endorsed.dirs=/app/jboss4.2.0/lib/endorsed -classpath /apps/shared/jboss4.2.0/bin/run.jar:/app/jboss4.2.0/jdk/lib/tools.jar org.jboss.Main -c DctmServer_MethodServer -b 0.0.0.0

But when I run the script, it shows as "not running", in other workds it doesn't goes to "ELSE" clause.

Can you comment, please.

scottn · #4 (**permalink**) 2 Weeks Ago

Ah, ok, sorry, perhaps a general search:

Code:


PID=$(ps -eo pid,comm | awk '/jboss/ {print $1}')

haroon_a · #5 (**permalink**) 2 Weeks Ago

still the same thing, Scott.

Can you tell me which values does the following compare?

if [ -z "$PID" ]; then

scottn · #6 (**permalink**) 2 Weeks Ago

I don't have jboss running, but if I substitute that for something else then it works fine.

Code:

PID=$(ps -eo pid,comm | awk '/mingetty/ {print $1}')     
/home/oracle/tmp > echo $PID
2499 2500 2501 2502 2503


> cat Test
PID=$(ps -eo pid,comm | awk '/mingetty/ {print $1}')     

echo $PID

if [ -z "$PID" ]; then
  echo no mingetty running
else
  echo alles gut!
fi
-----------------------------
> ./Test
2499 2500 2501 2502 2503
alles gut!

Just saw it's AIX.

Try

Code:

PID=$(ps -ef | awk '/jboss/ {print $2}') 
if [ -z "$PID" ]; then
  echo not running
else
  echo is running!
fi

haroon_a · #7 (**permalink**) 2 Weeks Ago

Quote:

Originally Posted by scottn

I don't have jboss running, but if I substitute that for something else then it works fine.

Code:

PID=$(ps -eo pid,comm | awk '/mingetty/ {print $1}')     
/home/oracle/tmp > echo $PID
2499 2500 2501 2502 2503
 
 
> cat Test
PID=$(ps -eo pid,comm | awk '/mingetty/ {print $1}')     
 
echo $PID
 
if [ -z "$PID" ]; then
  echo no mingetty running
else
  echo alles gut!
fi
-----------------------------
> ./Test
2499 2500 2501 2502 2503
alles gut!

Just saw it's AIX.

Try

Code:

PID=$(ps -ef | awk '/jboss/ {print $2}') 
if [ -z "$PID" ]; then
  echo not running
else
  echo is running!
fi

Scott,

That worked! Thanks alot and real appreciate it.

---------- Post updated at 03:32 PM ---------- Previous update was at 03:11 PM ----------

On a seperate note:

Now I know how to get the processes for my jboss, and store it in a vriable.

I want to issue another ps command on those PIDs of jboss, later on in my script to see if they are still running or not. i.e.

Code:

PID=$(ps -ef | awk '/jboss/ {print $2}') 
if [ -z "$PID" ]; then
  echo not running
else
  echo is running!
fi
...
...
# do some other things here...
...
...
# Now i want to issue a ps command on those process IDs stored in $PID, to see if those process are still runnning.

Can you please advise...

Thanks again.

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