Question 26810 in CentOS Question posted in
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Exporting top data to a file – CentOS

So I’ve been trying to run the following command to check the consumption by the firefox process.

top -b | grep "firefox"

Now I can see the desired output in terminal for it. But now when I try to export it to a file, I’m not able to.
The command I’m running is:

top -b | grep "firefox" >> filename or top -b | grep "firefox" > filename

Please help.

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2

Answers


  1. 0

    You need the -n parm for top. For example,

    top -b -n 1 | grep "firefox" >> firefox.out

    Without -n 1 top will keep processing and will never make it to grep..
    From the man page for top:

       -n  :Number-of-iterations limit as:  -n number
        Specifies  the  maximum  number of iterations, or frames, top
        should produce before ending.

    Updated code with a while loop. It will loop forever unless you use
    something like cntr variable. Remove the cntr code if you want
    continuous monitoring:

    #!/bin/sh
#
not_done=1
cntr=0
# Look for process firefox every 1 seconds
while [ "$not_done" -eq 1 ]
do
  top -b -n 1 | grep "firefox" >> /tmp/firefox.out
  sleep 1
  ((cntr=cntr+1))
  # Addition logic to break out of loop after 10 iterations
  if [ "$cntr" -eq 10 ]
  then
    not_done=0
  fi
  echo "cntr=$cntr"
done
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  2. 0

    You have to add in the command the flag -n
    Change the number of processes to show. You will be prompted to enter the number.

    To take a snapshot of a specific process in top utility, execute command with the PID (-p) flag.

    Also i recommed if you want to take snapshots for the process one (PID), and get taking three snapshots of the PID:
    top -p 678 -b -n3 > monitoring.out

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