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

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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.
0
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1answer
36 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 ...
2
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1answer
32 views

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 ...
1
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1answer
423 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 ...
4
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2answers
2k views

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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2answers
148 views

How are zombie processes handled when the parent dies?

Which technique does the Unix system use to remove zombie processes whose parent has terminated?
5
votes
2answers
80 views

Suspend process without killing it

So I've got a persistent program running in the background. Killing it just causes it to restart with a different PID. I'd like to suspend it (put it to sleep without actually killing it). Does kill ...
0
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1answer
44 views

How can I pause or freeze a running process? [duplicate]

I would like to pause/freeze a process in time; how can I do that? Not duplicate because kill -STOP <PID> has caused applications to crash when I've used it.
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votes
5answers
2k views

How to get a process uptime under different OS?

Under Linux I can get a process's uptime in seconds with: echo $(($(cut -d "." -f1 /proc/uptime) - $(($(cut -d " " -f22 /proc/$PID/stat)/100)))) But how can I get it under different OS? ex.: ...
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1answer
39 views

How to handle broken link after file deletion.in /proc/<pid>/fd directory?

A process is creating huge number of log files and also deleting it. Many of those deleted files are having broken links in the /proc/pid/fd directory. Do these file handles need to be closed by ...
1
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1answer
54 views

Script to ensure that only one instance of Oracle is running

I'm an Oracle DBA and need help/suggestion to understand a weird situation that came up today. One of our DBA job failing with saying 'Already its running' from Tivoli scheduler. However that is not ...
1
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2answers
44 views

How to detect which process filled up disk space

During weekend my Debian based proxy crashed due to insufficient free space. After reboot it was fine again, so on monday I went hunting for logs and/or explanations for saturday hang but I couldn't ...
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4answers
31k views

How can I kill a particular thread of a process?

$ ps -e -T | grep myp | grep -v grep 797 797 ? 00:00:00 myp 797 798 ? 00:00:00 myp 797 799 ? 00:00:00 myp 797 800 ? 00:00:00 myp This shows the process ...
4
votes
3answers
232 views

How to completely detach a process

I want to spawn a process and run it at the top level so that when the shell exits, the process keeps running. I had mistakenly thought that nohup would do this, but when I exit from the shell (the ...
6
votes
2answers
3k views

What are pending signals?

When looking at the limits of a running process, I see Max pending signals 15725 What is this? How can I determine a sensible value for a busy service? Generally, I can't seem to find a ...
3
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0answers
36 views

What process state(s) is counted into cpu time?

Two observations of mine (correct me if wrong): In the output of time for timing a process, 'User' and 'Sys' come from wait (2) or times (2), depending on the particular system. In Linux ...
0
votes
1answer
3k views

Linux ps -elf command output, what is Process Flag meaning?

In output of ps -elf command in linux, we can recognize that process flag of 4 and 1, and process flag of 5, (sum of 1 and 4), but what is meaning of process flag 0 ? unfortunately, man does not help ...
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4answers
3k views

Alert when running process finishes

There are a few questions and answers on here with regard to being alerted when a process completes/exits(1, 2) – but these all assume that the user has issued said process themselves, and thus can ...
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6answers
14k views

Is there a program that can send me a notification e-mail when a process finishes?

I am a computational scientist, and I run a lot of lengthy calculations on Linux. Specifically, I run molecular dynamics (MD) simulations using the GROMACS package. These simulations can take days ...
3
votes
1answer
55 views

Identify files/processes that prevent remounting read-only

My system runs Debian Testing, and / is generally mounted as read-only. The main problem with this is, every time I install something or update the system, I cannot remount the filesystem (I get the ...
1
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1answer
71 views

OOM-kill a process from user with highest memory consumption?

I have a multi-user system, where active users should get a fair share of the available memory. Can I set up Linux to kill a process of the user with the highest total memory consumption? This will ...
1
vote
3answers
53 views

How shell processes the content of command line in order to execute?

How shell processes the content of command line in order to execute? Command first and then option and arguments. Dividing command line into segments. Processes from beginning to the end.
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1answer
50 views

Why is uninterruptible sleep indicated by 'D'?

From "man ps": R = Running or Runnable S = interruptable Sleep T = sTopped Z = Zombie D = uninterruptible sleep (usually IO) Where does this D come from?
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4answers
55k views

Alternatives for “lsof” command?

In many cases "lsof" is not installed on the machines that with I have to work, but the "function" of lsof would be needed very much (ex. on AIX). :\ Are there any "lsof" like applications in the ...
1
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1answer
91 views

How to create an orphan process without terminating the parent shell?

In a bash shell, to make nohup mycommand & an orphan process, I close the bash shell after running the command. Is it possible to do without terminating the parent shell? I would like to know if ...
3
votes
2answers
69 views

How can I kill process by specific name and exclude root processes

Not a long time ago we found out about pkill and we had in mind to start using it in a setuid (for root) script for global clean-up of processes. This could save us lots of stupid maintenance where ...
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4answers
58k views

Show running processes with file name(s)?

I am using putty to connect my linux server which my sites are in. I can run # ps aux | less to show running processes. But I want to display which files running these processes ? I have also ...
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0answers
132 views

What is the command erepc? Is this malware?

I noticed that my system was running slower than normal so I ran a top command. Hogging a ton of my CPU was a process called erepc that I can find no information on. PID USER PR NI VIRT ...
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1answer
78 views

Are kernel threads processes and daemons?

From Mauerer's Linux Kernel Architecture, Kernel threads are processes started directly by the kernel itself. They delegate a kernel function to a separate process and execute it there in ...
0
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1answer
100 views

What are the differences between KILL, SUSPEND and TERMINATE of a process

What are the differences between Kill a process Suspend a process Terminate a process In which situations each methods uses practically?
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2answers
83 views

Script to send email alert only when process change state

Below script checks whether MStrsvr process is running or not . The issue I'm facing is if i schedule a cron tab to run this script for every 1 hour it will throw email alert every 1hr that "MSTRSvr ...
20
votes
3answers
910 views

Limiting a specific shell's internet bandwidth usage

I want update my linux in one shell but by default wget or axel in updater use all the bandwidth. How can I limit the speed in this shell? I want other shells to have a fair share, and to limit ...
13
votes
5answers
13k views

How to send keystrokes (F5) from terminal to a process?

I'm using an Raspberry Pi in combination with Chromium (kiosk mode) to show up some stats. The Pi doesn't have an connected keyboard so I searched for a solution to send keystrokes from the terminal ...
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votes
2answers
113 views

How can I determine if a process is running unseen in terminal?

For ex - if I enter ping one.com the process will keep running - if I want to stop that process, I can type Ctrl C which if I'm not mistaken, will kill the process completely. If instead, I stop it ...
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1answer
42 views

Process Flag 1: Forked but didn't exec (use case?)

In the man page for ps, it lists process flag 1 as "process forked but didn't exec". What would be a common use case/situation for a process to be in this state?
11
votes
1answer
5k views

Nice and child processes

Can someone tell me what is the relationship between a specified nice level and child processes? For example, if I have a default nice of 0, and I start a script with nice 5, which in turn starts ...
1
vote
1answer
45 views

Most elegant way to terminate straced program

I want to capture a certain thing with strace and then immediately exit. This way the program stays alive: strace ... program 2>&1 | grep --line-buffered ... | read line. Is there a simple way ...
32
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9answers
5k views

How can I kill a process and be sure the PID hasn't been reused

Suppose, for example, you have a shell script similar to: longrunningthing & p=$! echo Killing longrunningthing on PID $p in 24 hours sleep 86400 echo Time up! kill $p Should do the trick, ...
3
votes
1answer
332 views

Process not closing when stdin is closed

I am starting a process with a program. I expect the process to terminate when the program does, since it loses its stdin. I terminated the program, then went to the proc/pid/fd for the process, ...
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0answers
18 views

Starting isolated namespace inside network namespace

I've managed to create two network namespaces (ns1 and ns2) and connect them via veth connection. They can ping each other fine, and even ssh one into another (provided I started sshd). What I would ...
2
votes
3answers
544 views

bash - get pid for a script using the script filename

I have two scripts: running_script script_one I need to get the PID for the/any instances of running_script running under a username, and then pkill to stop the running_script and daughter ...
15
votes
1answer
866 views

Why can I list other users processes without root permission?

Using ps -aux or top, I can list other users running processes, but i'm neither running as root or making use of sudo, why ?
1
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2answers
147 views

Differences between system processes, and user processes, kernel control paths and kernel thread

My understanding is that a process always runs in user mode and uses user space only, and a kernel always runs in kernel mode and uses kernel space only. But I feel that I might not be correct, ...
66
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2answers
94k views

There are stopped jobs (on bash exit)

I get the message There are stopped jobs. when i try to exit a bash shell sometimes. Here is a reproducible scenario in python 2.x: ctrl+c is handled by the interpreter as an exception. ctrl+z ...
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3answers
68 views

On `fork`, children processes, and “subshells”

This post is basically a follow-up to an earlier question of mine. From the answer to that question I realized that not only I don't quite understand the whole concept of a "subshell", but more ...
22
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6answers
14k views

How can I close a terminal without killing its children (without running `screen` first)?

sometimes I run an app in the gnome-terminal, but then I suddenly have to restart gnome or something. I guess the answer to the question is also useful then I want to disconnect from SSH where ...
0
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2answers
127 views

Service vs Process?

chkconfig has five distinct functions: adding new services for management, removing services from management, listing the current startup information for services, changing the startup ...
2
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1answer
26 views

Embedding a binary and exec it, feasibility

I have a binary daemon that depends on another binary daemon at runtime to exist; I don't like this arrangement. (My code works on both OS X and Linux I say linux because I believe its okay to only ...
4
votes
1answer
90 views

bash does not exit on abnormal exit of child process due to signal

I try really hard to understand what I am doing wrong and why? I have a launch.sh script which launches process.sh. launch.sh #!/bin/bash while true; do ./process.sh done process.sh ...
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20 views

killing subprocesses and traps

I have the following two scripts which simulate some work: start.sh simply launches 2 (mpi) processes with script mpiproc.sh. start.sh #!/bin/bash function trap_with_arg() { func="$1" ; shift ...