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

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Cannot kill teamviewer process

My main desktop has Mint 14 and I approached it via SSH from another computer, because I didn't have a screen on the Mint one. Then I tried to start teamviewer just I order to launch its desktop ...
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Can't terminate PHP daemon process

I've started a PHP daemon process via SSH with php ./my-script.php --daemon Now I want to quit this process, but I can't. It's still active in the foreground of my shell and I've hit CTRL + C ...
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Check for Process if Same is Running

Is there a script or a way in linux that when I try to execute a shell script/process, if the same is running, it will prompt that same is running and will exit otherwise it will continue.
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What is the [rc0] kernel process?

I have several servers. A few of them are running ubuntu 12.04 LTS. I'm looking into an intermittent hanging issue, and noticed an [rc0] kernel process From ps -ef: ... root 1025 2 0 ...
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In bash script, how to capture stdout line by line

In a bash script, I would like to capture the standard output of a long command line by line, so that they can be analysed and reported while initial command is still running. This is the complicated ...
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Processes lose attachment to shell when started via bash -x

Normally, if I run emacs & and then close the shell, emacs will exit. However, if I run bash -x foo.foo (where foo.foo is a script that runs emacs &), then emacs will remain open even when I ...
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Can a script be running even after it's been killed?

I know it sounds so stupid and I know it IS stupid but I ran a unix script to send me and my friend emails every few seconds to test mailx. Stupid thing is I used $ while true; do blah blah blah... ...
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Why pidof and pgrep are behaving differently?

I have a init script in /etc/init.d/myservice for initialize a service like this: ... start() { ... daemon /usr/sbin/myservice ... } stop() { ... pgrep myservice pidof myservice ps -ef ...
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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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69 views

Why my cpu spend so much time on system? [closed]

top - 08:58:42 up 20 days, 8:23, 1 user, load average: 67.17, 58.94, 62.75 Tasks: 630 total, 40 running, 524 sleeping, 0 stopped, 66 zombie Cpu(s): 57.3%us, 41.6%sy, 0.0%ni, 0.0%id, 0.0%wa, ...
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A command which returns either a process ID, if running, or some other output if not?

I'm looking for a command that will give me the PID, and it's not running it should give me some output other than blank. In my program, sometimes the library I'm using gives blank output even if ...
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Why does kill not have a parameter for file and not for port number?

If I want to stop a program given its tcp port number or its file or named executable, can I run something like kill -tcpPortNumber $1 where the parameter $1 is a tcp port number or kill -filename $1 ...
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422 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 ...
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kill a group of processes with negative PID

kill -TERM -PID is supposed to kill PID and all its child processes. but this doesn't work on openSUSE, it always tell me that no such process -PID no matter what PID i use. So if the negative PID ...
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44 views

Is there a way to check which process terminates first during reboot

Assuming I have 2 processes running. Is there any way for me to check which process terminates first during reboot/shutdown? From this link, it tells about appending boot to a file. Yet, I still don't ...
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448 views

How can a normal user trigger a root cron task to execute immediately, without delay?

I have a root cron task that runs every day. But I want to allow normal users to request that it run immediately, if they so wish. It is a harmless process and it can run as often as needed and these ...
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172 views

Track down process that has notty

I have a Linux server (Red Hat 2.6 kernel) which had a spike in load due to an Rsync process which seems to have forked many times, but the process was run by rsyncuser@notty I didnt see any cron job ...
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330 views

Bind9 — How to find which programs are making which dns lookups?

Using bind9 on a laptop shows lots of nonsense domains when network connectivity is down: Oct 18 19:56:18 lap3 named[1536]: error (network unreachable) resolving './NS/IN': 128.63.2.53#53 Oct 18 ...
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113 views

spawning multiple Background processes

I have a file which has 2,000,000 lines in it. I am running some commands for each line. I was trying to achieve some parallelism using GNU-parallel and swift as discussed here. However, I got an ...
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606 views

Turning off swapping for only one process with cgroups?

I would like to turn off swapping for only one process. Swap should work as usual for the other processes. How I can implement this with cgroups?
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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, ...
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78 views

Limiting processes by memory under Linux

We must launch several hungry processes on a Linux system. These processes often need several Go (~5Go) of memory to run (total memory: 16Go RAM + 2Go swap). At first, when the system was running ...
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218 views

What's the best strategy to catch mystery process?

I have running processes on my server that get killed every night at midnight. It's at work, I'm not around when it happens and I don't have remote access. The kill occurs very predicably at 23:59 ...
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585 views

Negatives of running processes with real-time priority?

The question is as the title says, are there any downsides of running processes with real-time priority (chrt -f 99)? My hypothesis is that this combined with an affinity will ensure that any ...
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If you ^Z from a process, it gets “stopped”. How do you switch back in?

I accidentally "stopped" my telnet process. Now I can neither "switch back" into it, nor can I kill it (it won't respond to kill 92929, where 92929 is the processid.) So, my question is, if you have ...
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147 views

Gnu Parallel: more than one per CPU? [closed]

If I only have two cores, does parallel only run two processes at a time? I guess I'm still confused about processes, threads, and cores....
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Is there a way to limit the amount of memory a particular process can use in Unix?

I need to test a process for memory management. I do not have the source, so I need to do all the testing from the OS side. I want to be able to say something like limitmemory 400k -p <pid> ...
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81 views

How can I rejoin a process running

I am very new to using Linux. I have a 'machine' on Amazon and I was trying to learn how to use Python on this machine. I started running Python—had to step away for a few minutes and the connection ...
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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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124 views

Full path name of bash? and base process of Linux?

I am new to Linux and I recently had a test at school which had the following questions: What is the full path name of bash? What is the base process of Linux? I couldn't answer these. Does anyone ...
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54 views

How do I identify the user that is attempting to create a file?

I have a PHP script that is attempting to create a file, but it can not because of permissions. I would like to identify which user the system sees as the one requesting to create the file. I would ...
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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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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 ...
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how to find out namespace of a particular process?

I already asked a question about how to list all namespaces in Linux, but there wasn't any correct and exact answers, so I want to find out a method which can help me to find out the namespace of PID ...
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103 views

How to renice a group of processes?

lb build can build live system image, and it invokes many processes while building the image. If I start it as below: # nice -n 19 ionice -n 7 -c 3 lb build all the children processes get the same ...
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tftpd runs as root, despite explicit option “--user tftp”

I start my tftp server with the option --user tftp so that it runs as user tftp instead of root. However, ps shows that the process still runs as root ps aux| grep tftp root 2542 0.0 0.0 ...
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ssh ncat keeps ncat process running after disconnect; how do I prevent that?

If I run the command $ ssh othermachine ncat localhost 10000 that opens an ssh session to "othermachine" and pipes it into an ncat process. (There's something else listening on "othermachine" port ...
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Simple queuing system?

Given a commodity PC, we would like to use it to execute some tasks in the background round the clock. Basically, we would like to have commands like: add-task *insert command here* list-tasks ...
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What is the maximum value of the PID of a process?

What is the maximum value of the PID of a process? Also, is it possible to change the PID of a running process?
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Getting information about a process' memory usage from /proc/pid/smaps

For a given process in /proc/<pid>/smaps, for a given mapping entry what are: Shared_Clean Shared_Dirty Private_Clean Private_Dirty Is Shared_Clean + Shared_Dirty the amount of memory that ...
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How to get the Job ID? [duplicate]

As we know, the shell enables the user to run background processes using & at the command line's end. Each background process is identified by a job ID and, of course, by it's PID. When I'm ...
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Why do forked processes sometimes appear with brackets [] around their name in ps? [duplicate]

On a Linux system a C process is started on boot, which creates a fork of itself. It is not a kernal process or something. In most cases a ps -ef show both processes as expecxted, but sometimes it ...
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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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63 views

Increase nice value for many processes

Say I have launched a couple of non-timecritical applications such as a text editor a web browser etc and one more time critical (audio)application. Is there a utility that simulates the opposite of ...
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Can I somehow add a “&& prog2” to an already running prog1?

Most shells provide functions like && and ; to chain the execution of commands in certain ways. But what if a command is already running, can I still somehow add another command to be executed ...
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Processes do not respond to my signals

I have a strange behavior on my system. When I invoke a command in the shell (bash version 4.2.45(1)-release), say top or cat, the running program (the process) does not respond to Ctrl+C. I even ...
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Is there a way to tell which file (script, specifically) executed a command?

I'm running Slackware 13.37, and I was wondering if there was a way to tell which script executed a command. I tracked the process and its arguments, but I would like to know where the command ...
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1answer
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bash: Run command in background and capture pid [duplicate]

Am writing a bash 4.1 script... Would like run another script (or internal function) in the background... And capture the pid of that background job in a variable in the foreground script... If the ...
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190 views

Why do I need dbus?

I recently removed dbus from my system (along with consolekit and polkit). I didn't notice any change (I was running it as system daemon and per-user from .xinitrc). However, many people claim that ...
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fg a bg process because you forgot to redirect output to /dev/null

I did Ctrl+Z bg with the intention of disowning next, but I forgot to redirect, now I cant get to my terminal because the scrolling of the output (tarballed a huge directory with verbose set). How do ...