A process is an instance of a computer program that is being executed.

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How to get pid of subprocess from the subprocess itself

How can I get pid of a subprocess from the subprocess itself? foo() { echo pid=$$ echo spid=$! echo bpid=$BASHPID } echo PARENT_PID=$$ foo & wait on first run I get: PARENT_PID=17112 [...
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linux on aix dont work pgrep -lf ora_pmon

pgrep -lf ora_pmon ksh: pgrep: not found. somebody know who to change the code without pgrep this is the result on another Os pgrep -lf ora_pmon 4104 ora_pmon_dbpicsr 5092 ora_pmon_dbpiss2r 14393 ...
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68 views

How “Max open files” soft and hard limit are set for specific process?

I used the cat /proc/<pid>/limits command to check the Max open file hard and soft limit, but I want to know how this value will be set and can it be increased or decreased? Is this value is ...
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1answer
148 views

I kill process but come back

I have a big problem on centos 6.4 i kill this(8904) but he come back and use the processor. How can we solve? I don't use apache(httpd) on my server. apache don't installed on machine. it's a zombie(...
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1answer
35 views

How to find the top 5 process in the CentOS server? [closed]

If anybody is asking about to check the top 5 process in the CentOS server
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137k views

Finding the PID of the process using a specific port?

I am installing hadoop on my Ubuntu system. When I start it, it reports that port 9000 is busy. I used: netstat -nlp|grep 9000 to see if such a port exists and I got this: tcp 0 0 ...
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85 views

What are the default stdin and stdout of a child process?

I would like to know what are the default stdin and stdout of a child process (if there are such defaults). Are stdin and stdout of a child process the same as its parent process? Is this something ...
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2answers
26 views

Preventing the accidental killing of wrong process in htop

I frequently use htop to kill certain processes. To find the process I usually execute "Search" via F3. However, the list of processes refreshes frequently, and in many occasions, before I could press ...
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Understanding top and load average

I'm observing a high load average on a certain machine (about 9) in all three load fields. I understand load as the number of processes in state "run" / currently desiring CPU time. Am I correct at ...
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36 views

apt-get failed to fork in UML (user mode Linux)

I'm running a user mode Linux (Linux-3.19.8) for development testing. I'd like to be able to edit files inside the UML. I have some experience with Vim, so I'd prefer that. But unfortunately when I ...
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When a process will go to 'D' state?

I'm using "Linux hostname 2.6.28-15-generic #49-Ubuntu SMP Tue Aug 18 18:40:08 UTC 2009 i686 GNU/Linux" All the client machines will use Thin-client ,I will use my laptop for working and I will ...
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how to keep supervisord sub-process alive when supervisord was killed

I found when supervisord was killed, the sub-processes which controlled by supervisord also were killed. So I'm wondering that how to keep the sub-processes still alive when supervisord was killed.
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System management locked out by zypper process; refuses to kill

I am attempting to run zypper install nmap on openSUSE Tumbleweed (KDE), but when I attempt to do so I see the following error: System management is locked by the application with pid 12063 (zypper). ...
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1k views

Why do some programs return to the shell immediately while others don't until execution is complete?

I have read from the Modern Operating systems book that when a command is run, the shell creates a child process, waits for it until the child has finished execution and then waits for another command ...
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36 views

Upstart job starts the script twice

I am using Ubuntu 14.04.4 LTS (GNU/Linux 3.13.0-85-generic x86_64) where I created a simple Upstart job: # content of /etc/init/listener.conf start on runlevel [2345] stop on runlevel [!2345] ...
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Fix “firefox is already running” issue in Linux

I am trying to open Firefox in CentOS, but I'm getting the following message: Firefox is already running but is not responding and Firefox doesn't open. I tried this in command line: kill ...
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3answers
1k views

Is it good to utilize ~100% CPU by my application [closed]

I have an application written in C++ on Linux (Ubuntu 12.14), which decodes audio and finds the peak. This calculation is running on a background thread. From the main UI thread, I am calling the ...
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1answer
52 views

How to stop a “watch” process

I use "Pleeease" to watch CSS files and automatically compile them when any change happens. I did pleeease watch and then just close the terminal, the wathcing process keeps running. Now I want to ...
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1answer
30 views

How to know what exactly is being written or which process is keeping my storage disk busy?

I have a server , which has gone rogue(not really), i ran nmon and saw that its Disk utilization is BAD, its 100% busy writing!! Here is the output : Can someone tell me what is keeping my disk ...
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5answers
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How to view the output of a running process in another bash session?

I have left a script running on a remote machine from when I was locally working at it. I can connect over SSH to the machine as the same user and see the script running in ps. $ ps aux | grep ...
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view stdout for another pts [duplicate]

Here is the situation. I left my pc at home doing an rsync from a 2TB hard drive to another 2TB hard drive (it's going to take a while since they are both USB 2.0). I am now at work and I have ssh-ed ...
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How to FG a Background Process without jobs, fg, etc [duplicate]

I am SSH'ed into a Ubuntu Server. I started a process and closed the terminal window, reconnected to the server. Using TOP I can see the process is still running smoothly, but I did not assign a job ...
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743 views

Maltego stuck in Loading Modules

I'm using Kali Linux 2016 on Vmware 12 player. I'm trying to run maltego(first time) and it's stuck on loading modules. any suggestions?
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Wait for program in a clean way (e.g. in a different terminal window)

If you want to execute one command and then another one after the first one finish, you can execute command1 & which prints the PID of the process executing command1. You can then think of ...
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Why do processes not fill up empty process IDs

Everybody knows that PID number 1 is systemd (or something equivalent). And every process after that takes another PID, counting up. However when there are 50 processes running (up to PID 50) and ...
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47 views

Duration of /proc/pid/stat

I have a process that starts a child process and when the child exits, scans /proc/<pid>/stat to gather some information about the CPU and memory the child used. However I am worried that I am ...
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How to set per process swapiness for linux?

/proc/sys/vm/swappiness is nice, but I want a knob that is per process like /proc/$PID/oom_adj. So that I can make certain processes less likely than others to have any of their pages swapped out. ...
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When interrupting a process, does a memory leak occur?

Lets say I created a program in c/c++, where I manually allocated some variables. Then while running the program, I send an interrupt signal (Ctrl-C). Are those variables freed from memory, or will ...
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37 views

How to know the path of a running executable?

I am working on a Linux server, and I running different jobs on different node. However, when compiling my program, I didn't set their specific name, so they are all a.out Now I found one of the ...
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70 views

How to get the number of threads on the waiting queue for a cpu?

Is there a way to programmatically get the number of threads waiting for cpu on Linux.
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87 views

What is happening after kill -CONT <PID>?

I have suspend a process through kill -TSTP <pid>. Then tried to continue it with kill -CONT <pid>. But After completion of process, control is not returning to bash. Why this is happening?...
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How to check which process is using most memory

When I check free in one of Prod server it showing 70% of memory is being used: total used free shared buffers cached Mem: 164923172 141171860 23751312 ...
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How can I pause/resume rsync

How can I pause an rsync that's running? First time I did Ctrl+C to kill it and used the -P flag to run again. Is this prone to corrupt the current file transfer? Second time I simply put MacOS to ...
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Who is stealing my pids?

I noticed that my Debian Jessie system is using many pids, even when the system is (should be) largely idle. The following shows that more or less 270 pids are used per 10s, while the number of active ...
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1answer
74 views

What are these processes and why can't I kill them?

(On OS X 10.11.3) I'm having a problem starting a java process that needs to listen on port 8040. Getting a BindException. So seems like somebody else is already listening on it. A quick check ...
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Finding number of child processes of a particular process

I have a Python script that spawns a few subprocesses but never more than n at a time. I want to write a shell script to confirm that it has no more than n subprocesses at any given time, but also ...
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4answers
139 views

<defunct> processes remain behind

I have an embedded system that was going non-responsive after running for several hours. After investigating I found that the system kept growing a list of <defunct> processes. Running ps axl ...
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1answer
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How do I connect a USB mass storage device that has a custom pid and vid?

I have a device, custom mp3 player, that the pid and vid show up as a011:a011. dmesg usb 1-1.1: new high-speed USB device number 4 using ehci-pci usb 1-1.1: New USB device found, idVendor=a011, ...
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1answer
354 views

How do I execute in background / return early?

For reference, I'm using phpseclib to control a remote SSH server using the 'root' account. I have to start/stop a java process which is ran in the background. Stopping works fine with killall java ...
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38 views

Is there any way to find a process (or at least the existence of a process) by working directory?

I know that you can find the working directory of a process a few different ways, but is there any way to do the reverse? I have some server applications written in node that are unfortunately tricky ...
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55 views

How to find an ssh session a process was started from

How can I find a process which was started from some ssh session. For instance, I gave same ssh cridentials (aka. userzxc/passwordzxc) for my several friends which IPs i already know. My goal is to ...
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1k views

How can I get the wall clock time of a running process?

I started a hash check of a large file and don't want to restart it using time. How can I get the wall clock time without using time at the beginning or using date right before I invoke a command?
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How can I start a process using cpulimit?

I am trying to use cpulimit for testing an app I'm developing under low resource conditions, and I need the process to start under the influence of cpulimit. It is not sufficient to start the program ...
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2answers
65 views

How to get all processes, currently running in kernel mode?

How can I list processes that are busy in a system call? Is there a way to find it out with the command top? I couldn't find any appropriate option in the man pages.
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1answer
47 views

Task running even after killing it

I am running kibana service in centos using nginx. kibana deployment - i followed this . When I check Kibana status i am getting as not running, But when i see it using ps -eaf | grep kibana i ...
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Is there any command that limits the use of cpu resources by percentage?

So far I've been using nice -n 10, but that's just sets the priority of the command I want to run low, but if there's no other process running at that time the command will take all the remaining cpu ...
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442 views

List of running processes

There is a top command to show running processes. I would like to print sorted list of unique values in field COMMAND. There is my solution for this task $ top -b -n 1 | tail -n+8 | awk '{print $12}'...
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How to get start time for a defunct process on AIX?

When I run the following commands on AIX: 22:root@SERVER:/root # ps -ef | head -1 UID PID PPID C STIME TTY TIME CMD 22:root@SERVER:/root # ps -ef | grep defunct | head -1 ...
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How are zombie processes handled when the parent dies?

Which technique does the Unix system use to remove zombie processes whose parent has terminated?