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Accepted
Frankie
Asked: 2011-01-07 01:27:13 +0800 CST

monitor open process files on linux (real-time)

  • 772

The files opened by XYZ process can be found with the command

ls -l /proc/PID/fd

Is there anyway that can be done in a more interactive way like tail auto-refreshing every x seconds?

monitoring files performance-monitoring process

4 Answers

  1. Best Answer

    Try the watch command:

    watch -n 10 ls -l /proc/$$/fd

    Watch is nice.

    You could use an old school while loop:

    while :
do
 ls -l /proc/$$/fd
 sleep 10
done

    watch is in the procps package on debian based systems and the procps rpm on RedHat derived systems.

    • 19

  2. If you want to see each file as it is being opened, you can filter that with strace. For example:

    strace -p _pid_of_app_ -e trace=open,close
    • 13

  3. You could combine lsofand watch.

    For example watch "lsof -p 1234" will give you a list of all open files of pid 1234 every 2 seconds. You could change some parameters to meet your needs.

    • 5

  4. I created a bash file where I was writing the output of the command to a file. File was generated on the basis current date. Here I am counting number of open files.

    #!/bin/bash
while :
do
 cd /proc/<PID>/fd
 today=$(date +"%m-%d-%Y")
 filename="/tmp/${today}.txt"
 ls -l | wc -l >> "${filename}"
 sleep 10
done
    • 1