ps ax|grep


 
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# 1  
Old 05-05-2010
ps ax|grep

Hi guys!

I am trying to find out if an application (Rserve) I've started in daemon mode is actually running

To do this, I use the following command: ps ax|grep Rserve

This is the output I get:
18423 ? Ss 0:00 /home/Rserve

My question: Why is it notated by 0:00? Does this mean Rserve is not actually running?

I am not sure. Because when I start Rserve, it gives me a script output saying that it has started in daemon mode - but it is unclear

Thanks!
# 2  
Old 05-05-2010
you should try to egrep the Header row from your ps output as well as your target string...it helps to keep things legible. Looks this is the dummy timestamp (ie, the epoch) for the server process:

Code:
/usr/ucb/ps ax |egrep 'PID|Rserve'

# 3  
Old 05-05-2010
thanks for the reply!

It gives the same results as before:
Code:
 PID TTY      STAT   TIME COMMAND
18423 ?        Ss     0:00 /home/Rserve
18748 pts/0    S+     0:00 egrep PID|Rserve


Last edited by Scott; 05-05-2010 at 08:16 PM.. Reason: Code tags please...
# 4  
Old 05-05-2010
Well, according to the ps man page, it actually stands for CPU time:

By default, ps selects all processes with the same effective user ID
(euid=EUID) as the current user and associated with the same terminal
as the invoker. It displays the process ID (pid=PID), the terminal
associated with the process (tname=TTY), the cumulated CPU time in
[dd-]hh:mm:ss format (time=TIME), and the executable name (ucmd=CMD).
Output is unsorted by default.


Afaik it's 0:00 because it did not yet demand CPU.
# 5  
Old 05-05-2010
ermmm...pseudocoder might just be right.

However, it might be useful to just expand the resultset to go long:

Code:
/usr/ucb/ps augxww |egrep 'PID|Rserve'

# 6  
Old 05-05-2010
If it is in the "ps" list it is "running". As pseudocoder highlights it had not used measurable amounts of cpu time at the time you issued the "ps".
# 7  
Old 05-05-2010
Sorry for submitting my own query here, thought its related.

Last edited by sahilsardana; 05-05-2010 at 09:34 PM..
 
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