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

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29
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7answers
7k views

Block network access of a process?

Is it possible to block the (outgoing) network access of a single process?
28
votes
5answers
91k views

How to stop a background process?

I have started a wget on remote machine in background using &. Suddenly it stops downloading. I want to stop its process, then start it again. How can I stop it? I haven't close its shell window. ...
2
votes
1answer
62 views

Traverse the Process Tree

I am aware that processes are organized in the form of a hierarchy. So, if I want to implement an operation which is to determine whether a given process belongs to a given sub-tree in the hierarchy ...
0
votes
2answers
54 views

Best way to kill processes in a list

I've got this zsh script. Is there a more a graceful way to do this? export PROCESSES_TO_QUIT='puma rake sidekiq spring rails ruby-debug phantomjs zeus passenger guard resque "node server.js"' pgr() ...
3
votes
1answer
130 views

Command for killing specific PID provided by previous command

Sometimes I need to kill a process (the reasons why are not important). And I know I can find that process with the following command: lsof -i :8080, being my candidate the last process in the output ...
26
votes
3answers
45k views

Find and remove large files that are open but have been deleted

How does one find large files that have been deleted but are still open in an application? How can one remove such a file, even though a process has it open? The situation is that we are running a ...
1
vote
2answers
2k views

How do I run two ongoing processes at once in linux/bash?

I would like to know how I can run two ongoing processes at the same time in Linux/bash. basically, I have a Node web server, and a MJPG-Streamer server. I want to run both these processes at once, ...
2
votes
2answers
978 views

How to track file change

nsswitch.conf file always corrupts somehow. I do restore from my backup every time it corrupt. When this file corrupts, its time stamp is changing. Now I wonder if there is a way to track that file ? ...
41
votes
6answers
63k views

How to monitor CPU/memory usage of a single process?

I would like to monitor one process's memory / cpu usage in real time. Similar to top but targeted at only one process, preferably with a history graph of some sort.
5
votes
2answers
116 views

Find what process implements a FUSE filesystem

How can I get the process ID of the driver of a FUSE filesystem? For example, I currently have two SSHFS filesystems mounted on a Linux machine: $ grep sshfs /proc/mounts host:dir1 ...
2
votes
1answer
2k views

How is it that I can attach strace to a process that isn't in the output of ps?

I'm trying to debug why our integration tests are taking so long and it looks like they're hanging part way through. I logged onto our test service and saw the following behaviour: root@colossus:~# ...
2
votes
1answer
63 views

Unrealistically long process times displayed in top

I (partly) manage a small cluster and we are having some problems on a few nodes (running CentOS 6.4). Some processes show exceptionally long run-times in 'top', even though the computer has been ...
0
votes
1answer
60 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 ...
2
votes
1answer
58 views

Thin LVM pool frozen due to lack of free space, what to do?

My thin LVM pool got full and some programs hung: device-mapper: thin: 253:4: reached low water mark, sending event. device-mapper: thin: 253:4: no free space available. INFO: task jbd2/dm-6-8:742 ...
1
vote
0answers
23 views

How to get stdout of process? [duplicate]

I started a process from the command line, but the window server died. However I see the process I started is still running. Is it possible to connect a terminal to the process to see its output? ...
0
votes
1answer
37 views

start process from ssh and be able to close connection [duplicate]

I'm connecting to my RaspberryPi with Raspbian installed via ssh and my problem is, that I can't let the RasPi do things (installing software, make calculations) while my Computer is shut down, since ...
9
votes
4answers
772 views

Why are there many accounts? I'm the only user

I am running an Ubuntu 12.04 desktop system. So far I have only installed some programs (I have sudo rights). When I check the list of users on the system, I see a long list, like more than 20 ...
8
votes
1answer
277 views

What three files are always opened by a process?

Someone mentioned that there are three different files that a process always opens. What does this mean? What files are they?
4
votes
0answers
74 views

Disable networking only inside of a single terminal

I want to run a command in the terminal to disable networking, just in that terminal. How can that be accomplished? I'm running OSX. Note: I only want to disable the networking in that terminal. ...
1
vote
1answer
53 views

How can I monitor network connections for an app

I'm running a chat application on my machine called foo - how do I view all connection attempts (failed or successful) for foo? I have attempted this with netstat, but I am unsure how to associate ...
2
votes
1answer
50 views

What are `gom-*miner` processes?

I've got few running processes that eat up all my resources, blocked network and disk I/O, after some time whole computer froze, I couldn't even go to classical non-gui terminal. I've found them ...
3
votes
1answer
51 views

What could be happening between pidof and kill to cause “no such process”?

I've inherited quite a bit of code and am looking at a cron job that restarts a service once an hour, no other scripts touch this process and this code is ran. #The name of the process has been ...
1
vote
1answer
64 views

Disowned “Stopped” job process still appears in process table

I want to know why after disowning the stopped process, it is still appearing the process table PING www.google.com (74.125.130.106) 56(84) bytes of data. 64 bytes from 74.125.130.106: icmp_seq=1 ...
0
votes
1answer
54 views

Find out home directory of running Oracle instance

There are two oracle directories on our system: oracle oraclex How can I find out which of them is used by the running Oracle instance?
0
votes
2answers
177 views

Loginuid, should be allowed to change or not (mutable or not)?

I am trying to configure the linux kernel. I was confused by Make audit loginuid immutable (AUDIT_LOGINUID_IMMUTABLE) [N/y/?]. The help says: +config AUDIT_LOGINUID_IMMUTABLE + bool "Make ...
0
votes
1answer
74 views

Why PPID is different when opening from terminal and when opening by doubleclicking

I am using Linux. When i opened gedit program in gnome-terminal by gedit command it has opened the graphical gedit text editor. then the gedit has PPID bash ...
4
votes
1answer
9k views

I can't install new packages and can't update and upgrade

I'm trying to install some program on Ubuntu, but when I try it I got the following error.- E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable) E: Unable to lock ...
24
votes
3answers
25k views

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 ...
1
vote
2answers
64 views

How to keep a process from running?

I can kill a process. But how do I keep that process from being called up again without removing it from Linux? For example, if I run something like netstat to find the port associated with the ...
1
vote
2answers
57 views

Strange process behaviour on virtualized Ubuntu

I'm running Ubuntu 14.04 LTS on Windows 8.1 using VirtualBox. I'm approaching to Operating systems and the following program shows a strange result: #include <stdio.h> #include <unistd.h> ...
3
votes
1answer
89 views

Run a command in background that sets env var or define function

> export foo=1 & [1] 9016 [1] + done export foo=1 > echo $foo > I know when running a command with & you spawn a new process and the export foo=1 is not setting env vars in ...
91
votes
8answers
44k views

How can I disown a running process and associate it to a new screen shell?

I have a running program on a SSH shell. I want to pause it and be able to unpause its execution when I come back. One way I thought of doing that was to transfer its ownership to a screen shell, ...
4
votes
2answers
76 views

htop shows only the processes of the user that's running it?

On my old Debian Wheezy I see as a normal user without sudo all processes from all user in htop. On my new Debian Wheezy I only see my own processes. Old system kernel: 3.2.0-4 New system kernel: ...
2
votes
1answer
172 views

Determine the owner of the session of a process

I am trying to implement a way to determine which user is owner of some process's session, in a way that's as cross-platform as possible. In Linux I can trace the process's pty by following the link ...
8
votes
4answers
4k views

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 ...
3
votes
3answers
269 views

Starting a process from one terminal from another terminal

I was wondering of there is any method to start a new process or a program from one terminal into other. What I mean is: Let's say I have to run gedit abc.txt, but I don't want it to block my current ...
1
vote
1answer
1k views

How to kill a ghost process? AIX 6.1

oslevel: 6100-05-01-1016 according to topas: root 1769602 1 93 20 112 0 128 32498:07 87.1 0 0 ldmp_pro according to ps: -bash-4.1# ps -ef | egrep -i "1769602|ldmp" ...
2
votes
2answers
68 views

How to know the source of a process in Linux?

In our firm, we are using Fedora 14. Our developers are using Python code to process documents. All are running as root. Somehow they did something and a file came inside which makes lots and lots of ...
2
votes
2answers
127 views

replace `while` with more suitable function so looping would wait for each process to end

I have a bash script that look out for files recursively under multi-sub folders, then use ffmpeg to each file. at debug, it works great if i use echo ffmpeg but the thing is, at real work where it ...
2
votes
1answer
793 views

How to change the kernel max PID number? [duplicate]

The default PID max number is 32768. To get this information type: cat /proc/sys/kernel/pid_max 32768 or sysctl kernel.pid_max kernel.pid_max = 32768 Now, I want to change this number... but I ...
4
votes
2answers
47 views

Determining maximum memory usage for an extremely short process

I have a program I am testing and I need to determine the maximum memory used by the process. I know that in general ps -aux can give me this information, but the process runs in under 1/10 seconds ...
4
votes
2answers
160 views

My /var/log/ is mysteriously filling up GBs in minutes! Any cure before I re-install Debian 7?

Good morning, fellow *nix enthusiasts! I have been using Debian 7 for a while now and after a recent upgrade I noticed I constantly kept running out space on my root partition. I mean to the point ...
5
votes
2answers
9k views

Linux : See CPU usage by a process for the last second

vmstat 1 Above will print virtual memory statistics each seconds. It will also show the CPU utilization for last second. I have a web server at hand which runs httpd and MySQL. I need to find how ...
5
votes
3answers
451 views

Is there a way to really prioritize processes or make Linux respect their priorities?

I know there are process priorities like in other operating systems, going from -20 (most prio) to 19 (less prio) but Linux seems to ignore them. Right now I was building the kernel in the background ...
1
vote
4answers
227 views

Run linux process at very very low priority?

I have regular process that not so important but will consume so much CPU power, and I have another process which is really important, but it spend most of the time idle, but when it got a job it ...
4
votes
3answers
3k views

Slow down just one process to regulate CPU temperature

I have a program. When it is running, the CPU temperature raise from 50 to 80 Celcius, which is my major concern. I can control the CPU frequency to slow it down, but other processes will be slowed ...
2
votes
2answers
1k views

Find the PID's of all threads of a process without ps or pidof

So the system I'm working on (BusyBox) has a ps that takes no command line arguments and pidof returns nothing even though it exists within /sbin and points to killall5. Another issue I had is that ...
0
votes
0answers
90 views

how to find out why process is taking more cpu usage

Sometimes load goes high on server for java processes. Multiple java processes are running and consuming high load on server. I want to know how to check that why process is taking too much load.
3
votes
2answers
316 views

Monitoring process activities using system calls only (without utilities like `top`)

I want to obtain information about memory used by different users and different processes which users are running and statistics about those processes like memory consumption, execution speed, etc., ...
15
votes
6answers
5k views

What is using this network socket?

I'm trying to use NTP to update the time on my machine. However, it gives me an error: host # ntpdate ntp1.example.org 10 Aug 12:38:50 ntpdate[7696]: the NTP socket is in use, exiting What does the ...