Questions tagged [process]
Questions about identifying processes, about listing them, sending signals, killing them, assigning and using process priorities.
787
questions
2
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0
answers
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Caja running and can not kill it, Ubuntu 18.04 Mate
Caja runs constantly and restarts after I kill it, using 10-20% cpu on each of 4 cores.
If I stop it (but do not kill it) all is fine. When it runs the hard disk is constantly running as well.
What ...
8
votes
2
answers
15k
views
Bash script to verify if a process is running is not working
I have a simple script as below which checks if fail2ban service is running or not on Ubuntu 18.04:
#!/bin/bash
# Script to check if fail2ban service is running
if pgrep -x "fail2ban" > /dev/...
1
vote
1
answer
556
views
threads presentation in pstree
I read manual of command tree and confused about threads
Child threads of a process are found under the parent process and are shown with the process name in curly braces,
e.g.
...
11
votes
1
answer
666
views
Is this behaviour of VLC normal?
I'm on ubuntu 16.04 unity latest updates installed, I have one of the best Asus gaming laptops in the market, VLC is installed but I never use it.
For the last few months, I wasn't able to shut down ...
0
votes
1
answer
81
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How to locate that folder and files content related to every process newly started [closed]
According to my knowledge when we start a process. A folder related to that process is created somewhere else, and that folder have 2 sub-folders and then those sub-folders have sub-files.
My ...
0
votes
1
answer
135
views
How does Alt+F2 run a command directly as a child process of the init process?
On Lubuntu 18.04, if I click the desktop menu, and lxterminal in it, and run the the following in the terminal emulator window, I will get
$ pstree -a -p -s $$
systemd,1 --system --deserialize 19
...
4
votes
2
answers
7k
views
How to check when a process stopped running? [duplicate]
I'm trying to figure out when a command I entered stopped executing, for example
sudo apt-get update
I want information like:
started execution at : 12:00
finished execution at : 12:15
1
vote
0
answers
49
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I have noticed that sometimes my HD is spinning and spinning running "find command" on Xubuntu 16.04.5
When I start my laptop the HD is spinning executing find command without reason, I tried to clean saved sessions, looking in startup programs if there is any command using find command, but I couldn't ...
1
vote
0
answers
23
views
Stopping a task and resuming it with more allocated cores
Is it possible to start a task eg-
$ make xxx
then pause it, and resume it with more cores allocated?
$ <some-resume-command> <pid> -j
which would be the equivalent of switching to ...
1
vote
0
answers
116
views
Ubuntu Server requires service restart every few days
I'm new here and I hope you can help me out this time.
I have a MySQL server which receives many requests from my other servers...daily up to 1000 requests (HTTP and remote MySQL).
However, for some ...
0
votes
1
answer
999
views
Firefox doesn‘t start, because there‘s already a firefox process running
I‘m trying to launch firefox and it tells me, there‘d already be a firefox process running.
I tried listing the processes using ps -A, but there is no firefox process listed. I also tried killall -9 ...
0
votes
0
answers
278
views
The system call exit()
I have to make some modifications in the system call exit(), but I cannot find its implementation. I think that it calls the kernel method do_exit() but I am not sure.
Is there anyone who can say ...
0
votes
1
answer
3k
views
How can I kill a process in kernel?
I am interested in kernel development, and I am trying to find a way to terminate and kill a process. The only thing that I know is pid and task descriptor value of that process.
In other words, how ...
0
votes
1
answer
3k
views
Terminal not started in ubuntu 18.04
Ubuntu 18.04 failed to start terminal. It shows an Error message - -failed to execute child process gnome-terminal. Please help me to start terminal in my system.
0
votes
1
answer
1k
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Niceness and Priority of Processes
According to the some resources I have read, the process with low nice value has more priority. Because it has more priority, CPU allocates more time for that process.
However, it sounds a little bit ...
0
votes
1
answer
1k
views
Send multiple kill signals to a process
Say I run a .sh process. And now I open a new terminal tab and I want to send signals to it, for that, I just use kill:
kill -*signal number* *pid*
right? But I want to send 13 signals at the same ...
0
votes
1
answer
1k
views
How to Run Process Manager as Super User
I am trying to run an API on an Orange Pi. It is running Ubuntu and the API process is running via Node.js Express.
I would like the process to automatically start running when the computer boots up, ...
0
votes
3
answers
506
views
Does opening a new terminal tab use equivalent system resources to opening a new window when running scripts in parallel?
Is opening a new tab in the terminal window equivalent to opening a new tab in terms of resources?
I need to run 16 scripts in parallel. I do not know whether opening tabs or new terminals is the ...
1
vote
1
answer
327
views
Why does x-terminal-emulator sometimes exit on launch and sometimes not?
From my Java program, I launch an x-terminal. The Java waits for the x-terminal command to start. (It's a Datastore emulator for developers.)
Process proc = Runtime.getRuntime().exec("/usr/bin/x-...
0
votes
1
answer
218
views
How can I identify or find the origin of this mysterious process?
I have a strange process on Ubuntu 14.04 that fires up fairly frequently. It appears as a bash shell in top, I haven't actually located it in ps xfa.
When it runs, top says it's using 215% CPU and ...
2
votes
1
answer
668
views
How to know jar process
I launched on server, by crontab few jar (java) files (part1.jar, part2.jar...).
I can get are data of process:
lsof -i tcp:8080
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
java ...
3
votes
2
answers
828
views
Can I toggle a script with a shortcut key?
I have a bash script on my desktop called script.sh.
Currently, if I want to execute it, I open a terminal and type ./script.sh, and if I want to stop it, I have to press Ctrl + C
What I'd like to ...
9
votes
1
answer
5k
views
How to get a process exit status from another shell session?
Suppose I run a command in one shell session, for example bash -c 'apt-get update && apt-get upgrade'. 5 minutes later I decide to go outside for a snack, and realize I forgot to add some form ...
0
votes
1
answer
220
views
How to handle signal in foreground process?
I have doubt, why does we cannot use kill -s 9 <pid> or kill -s 15 <pid> to kill foreground process? When I am trying to do the same, getting result that process id does not exist ...
6
votes
4
answers
3k
views
Process hangs before termination with ubuntu 18.04
When using ABAQUS 6.14 (but also ABAQUS 2018) on ubuntu 18.04 everything seems to work fine except the termination of the standard process (the process started when performing an implicit analysis -- ...
1
vote
1
answer
12k
views
Unable to modify ulimit
I am on Ubuntu 18.04
Trying to modify max number of processes (hard limit) via the following command, and getting the respective error:
$ ulimit -H -u 500
bash: ulimit: max user processes: cannot ...
1
vote
1
answer
508
views
Ubuntu 18 keeps processes running
I noticed my Ubuntu keeps process running after ending an application. For instance after closing my vscode it still appears to be in the process and still takes up memory and I end up having multiple ...
4
votes
0
answers
2k
views
Random http command by user _apt with 100% CPU usage
A random process with the command http owned by the user _apt starts automatically and uses 100% CPU. What is it? And why does it keep starting? I have attached a screenshot of the top command ...
1
vote
2
answers
386
views
How to abort Fight Flash Fraud (F3)?
I am using the commands f3write and f3probe and want to abort them. There is no consideration of this in the manual and Ctrl-C is not working. I can kill the process in task manager but I was ...
5
votes
1
answer
11k
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ubuntu error : Errors were encountered while processing: redis-server
I am getting error when I run sudo apt-get upgrade
output error :
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 ...
6
votes
1
answer
3k
views
What is the gmain process?
I used lsof | grep home/$USER and I found that the gmain process likes to open my personal files. What does this process do and is there any available documentation that explains it in context of ...
1
vote
2
answers
186
views
Prevent other processes for performance
Let's say I have an .c and .cpp file which runs some code to calculate the duration of some process;
Basically I get microseconds between some method and I calculate how many seconds does this method ...
2
votes
0
answers
256
views
Track all process activity in real or near real time on Linux
I want to track the activity of processes.
For processes, forks, file access, etc. should be tracked.
Also files, data transfers, authentication events, authorization events, and similar.
It should ...
4
votes
2
answers
7k
views
How do I kill a Firefox process thrashing my computer? 18.04
In short: a Firefox process takes control of Ubuntu 18.04 LTS in my Acer TravelMate P, and it seems there's nothing I can do but to shutdown the computer. This is similar to https://superuser.com/...
0
votes
0
answers
1k
views
Unable to stop VIM with Kill, Htop, or anything else
I'm running Ubuntu Bionic. I installed SLiM display manager so my GUI uses tty2 and I ran vim to edit some C++ code in tty1. Suddenly, it froze completely. I tried to type things but nothing would ...
13
votes
1
answer
6k
views
How to limit resource usage for a given process?
I have a process for an application which needs to run, but ends up using far too much IO usage for what it does. And really crashes my computer, making it impossible to do anything else whilst it is ...
3
votes
1
answer
2k
views
Issues with running Apache Certbot due to port already used for httpd.bin
My goal is to get SSL running on my server to run over HTTPS. I'm trying to run the command sudo certbot --apache to generate a certificate for my server as part of these steps https://certbot.eff.org/...
35
votes
3
answers
40k
views
How to stop a bash while loop running in the background?
I started a while loop as follows:
while true; do {command}; sleep 180; done &
Notice the &.
I thought when I killed the terminal, this while loop would stop. But it is still going. It has ...
1
vote
1
answer
9k
views
How to find process name?
Does every service that is active running have a process that can be seen by ps command on linux?
If yes, how can I find the related process name?
For example if ntp is running, should I see it by ...
1
vote
1
answer
4k
views
How to respawn automatically a process(wso2am)?
I have an upstart script as
# Ubuntu upstart file at /etc/init/wso2am.conf
#!upstart
description "wso2am"
pre-start script
mkdir -p /var/log/wso2am/
end script
respawn
respawn limit 15 5
...
1
vote
1
answer
348
views
killing the bash interpreter
Im trying to kill /bin/bash but when I do
ps aux | grep "/bin/bash"
and I kill the pid associated with it, it gaves me an error.
Any help is greatly appreciated. Also can you tell me what's the ...
2
votes
2
answers
1k
views
Sending SIGSTOP or SIGCONT signals graphically (similar to xkill)
Question
Do you know any tool/script to send SIGSTOP (to pause a process) or SIGCONT (to resume it) to a process by clicking on a graphical window generated by the process?
Some context
There is ...
7
votes
3
answers
3k
views
How can I list running bash scripts by the name of the script?
ps returns bash as the name of the process... I would like the name of the shell script instead.
For instance, if my script is TestEric.sh, I would like to list the number of instances of that script ...
0
votes
0
answers
203
views
How do I look for a specific process and skip if it's not running?
I wanted to stop a particular process and proceed further, also if the same process is not running just wanted to print a message saying this process is not running and proceed further. How do I do ...
1
vote
0
answers
2k
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cupsd is consuming 100% cpu and creating large (832GB+) logs
I'm using ubuntu 16.04 LTS.When I was running ambari-server,cloudera image in docker container and apache hadoop the system was not responding anymore.One fine day I observed that my total hard disk ...
1
vote
1
answer
198
views
Run second screen process after first screen process complete?
Is it possible to start a screen process, but let it wait for another running screen process to complete? Basically creating two screen processes like so:
screen -S myfirstprocess
screen -S ...
2
votes
2
answers
135
views
How to perform process handling routines on a Ubuntu machine on a Windows system
On my Windows 10 machine, I've installed a Ubuntu system (as a Trusted Microsoft Store app). When I open that window and type help, these are the first lines I see:
GNU bash, version 4.3.48(1)-...
3
votes
1
answer
44
views
When you direct output to a file, is that file opened and closed exactly once?
When you redirect the output of a command to a file using >, and that process takes a while (like apt-get update) will the file being written to be opened and closed only once for the entire ...
3
votes
2
answers
5k
views
Why are instances of gnome-settings-daemon always running?
I have noticed recently that there are always instances of gnome-settings-daemon running as processes, why is this? And is it safe to disable them?
The explanation from the GNOME Wiki is:
[...] ...
7
votes
1
answer
4k
views
What is the difference between cat /etc/services and service --status-all?
I would like to know the difference between these commands to show linux services:
cat /etc/services
and
service --status-all