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

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8
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4answers
42k views

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 ...
22
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6answers
9k views

Can ps display only non kernel processes on Linux?

How can I ask ps to display only user processes and not kernel threads? See this question to see what I mean...
5
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4answers
885 views

Best practices for job/process tracking and multi-tasking

I run 10+ different commands from 10+ different directories, and I need a better process to track everything. I do a lot of debugging, and often times I need to work on multiple issues in parallel. I ...
1
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1answer
544 views

AIX why does ps display the process name between square brackets? [duplicate]

On AIX 7 I have a process whose name appears between square brackets in the ps output: PID TTY TIME CMD 7798784 pts/2 0:00 [myproc] 9044154 pts/2 0:00 ps 10485770 pts/2 0:00 ...
1
vote
3answers
143 views

How to know if a specific program is open

Using a command line in terminal, I want to be displayed 1 if a program (for example Firefox or Chromium) is open and 0 otherwise. Edit: By "open", I mean "is running on the current machine and has a ...
4
votes
2answers
409 views

Get PID of the application running in the active terminal emulator

My end goal is to be able to open a new terminal window (urxvt) directly in the current working directory of the program running in the window currently active. I'm currently using the shell (Bash), ...
4
votes
1answer
191 views

Raise Brightness When Maximizing Terminal

I'm looking to raise the brightness when I maximize or foreground the Terminal window which has Vim running. I would like to reset the brightness to normal when I minimize or background that process ...
2
votes
1answer
1k views

How to check if a currently running process is opened by root or user

I'm currently creating a BASH script to kill off processes. I first check if the process is running then kill it. But I would like to add a nested if to find out if that process was opened by root (...
10
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1answer
2k 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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2answers
1k views

How do I kill 'repo sync' using crontab given it spawns many processes?

I need to 'repo sync' the Android source overnight, as my monthly bandwidth is limited. , I start the 'repo sync' at midnight, then want to kill it at 8am. The following is the command: 2 0 * * * /...
0
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1answer
2k views

Identify Tasks/Process which are 7 days old in linux

How can I identify the processes running since 7 days in Linux?
1
vote
1answer
387 views

How to kill all processes that don't have specific parent process?

A parent process should always be running with N children process. I would like to run a script which will show/kill all children processes that don't have a parent process. $ ps faux | grep process....
2
votes
2answers
248 views

process memory usage

What is usually meant by the phrase process memory usage, what does this actually mean, i.e. what does this memory consist of? And what column does it correspond in ps aux output, RSS or VSZ?
5
votes
2answers
436 views

Is grandchild process also child process?

In Unix/Linux terminology, do child processes of a process include grandchild processes of the process?
6
votes
3answers
4k views

What is a process GID and what purpose does it serve?

Reading mod_wsgi's documentation I found you can choose which group to run the worker processes as. I can understand group ownership of files and how only a user who belongs to that group can achieve ...
7
votes
3answers
786 views

Dynamic file content generation: Satisfying a 'file open' by a 'process execution' [duplicate]

I have a read-only file, F. A program, P, that I'm not the author of, needs to read F. I want the content of F to come from another 'generator' program, G, whenever P tries to read F (taking F to ...
0
votes
2answers
4k views

`ps | grep | kill` aborts my script prematurely [duplicate]

I have a Linux computer that I remotely SSH into using plink on a Windows XP machine. I have a Plink program set to execute commands in a script using automated login: plink -ssh [domain name] -l [...
3
votes
3answers
747 views

Print process ID (PID) of a Matlab instance

To run my Matlab scripts, I've created a shell script to which I give two parameters - the path to the matlab file ($1) and to the log file ($2): nohup time matlab -some_parameters -r "run $1;exit" &...
3
votes
2answers
651 views

How to monitor the last PID assigned by the kernel?

To monitor process creation I'd like to periodically write the last PID assigned by the kernel to any process on the system (not just processes created by the PID-monitoring program) with a time stamp ...
1
vote
1answer
3k views

How to kill the (last - 1) PID with bash

I know how to kill the last process with kill $! However I would like to kill the last−1 process, i.e. not the last one, but the one before the last one. I tried kill $$(($! -1)) but ...
2
votes
4answers
591 views

Open program as root, close root session but still program is running

When I run my backup script, first I switch to root, mount a truecrypt partition and then run the script. I've noticed that after run truecrypt as root, I can exit the root session and truecrypt ...
0
votes
0answers
528 views

Tracing system call on Ubuntu 12.04

The main task I have to carry out, is to trace the system call of processes in ubuntu 12.04 LTS. Problem is, I am unable to trace them continuously, i.e. as soon as they are added to the system, they ...
6
votes
3answers
2k views

Can I pipe any two processes to each other?

In this page from The Design and Implementation of the 4.4BSD Operating System, it is said that: A major difference between pipes and sockets is that pipes require a common parent process to set ...
-1
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1answer
142 views

System call tracing [closed]

I am working on system call tracing for host based IDS, i need to trace a process as soon as it entered in the system (a new entry in /proc). Is there any interrupt or signal or kernel datastructure ...
3
votes
3answers
8k views

pkill can't kill processes with parent process id 1

I want to kill the following processes using pkill "run_tcp_sender.sh" or pkill -SIGKILL "run_tcp_sender.sh" root 14320 1 0 2012 ? 00:00:00 bash run_tcp_sender.sh 138.96....
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vote
1answer
457 views

How to trace process scheduling of certain process?

For a project at my university I am researching ways to trace, log and manipulate the process scheduling of certain processes. I would like to launch an number of applications, everyone in a single ...
1
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2answers
238 views

Single process accessible temporary file

I want to create a file that is only accessible to the process that created it (and potentially its children), and that disappears when the process exits, ideally never persisting the file to disk. As ...
4
votes
1answer
60 views

Suspend and edit previous single line commands

Say I want to modify the latter of some concatenated command line options, is it possible without killing the first command? Specifically I have compile and run scripts executed thusly: > compile ...
6
votes
2answers
2k views

What does it mean each process has a current directory?

I'm reading "The Unix Programming Environment", but I don't comprehend the concept current directory of process. Each process, has a current directory, and all filenames are implicitly assumed ...
7
votes
2answers
1k views

Kill user processess on logout

I have a Ubuntu server that handles remote X sessions from users. However, I don't want to allow users to run any kind of background processes - so here is my question: How do I prevent users from ...
6
votes
5answers
1k views

Is a persistent zombie process sign of a bug?

(OS: Debian variant.) Having a process with zombie-status. The PPid belonged to a gvim process. The contents of /proc/[pid]/wchan is do_exit, /comm is sh and /cmdline is empty, /status is shown ...
5
votes
3answers
610 views

How can you change the process name of Wing IDE from python to something more descriptive

In my process list under Ubuntu (using top/System Monitor) one of the largest memory hogs (200+Mb) was python. I searched a bit for one of my programs to be the cause until I realised this was my ...
6
votes
1answer
24k views

How to find Heap memory of a running process? [duplicate]

I would like to know how to find the heap memory of a process that is running in the background. Is there any command that allows such?
1
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1answer
413 views

How to demonstrate invalid PID assumptions?

It seems many programmers are happy with saving a PID to a file, and then later read and use the PID as if it was guaranteed to be the same process. It seems the general idea is that the odds are good ...
1
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1answer
583 views

List of killed processes HP-UX

Is there a file similar to the one in this answer http://unix.stackexchange.com/a/10078/5027 to determine the processes which were killed, in a certain time, for example, yesterday, in HP-UX?
1
vote
1answer
535 views

Do kernel counters for jiffies in state exist in Linux?

I am looking to get time/jiffie stats on the state of a daemon process. The states I'm referring to are mentioned in the Linux Kernel Proc Filesystem document. Running, Sleeping, uninterruptible sleep,...
10
votes
6answers
9k views

How do I start a process with a nice value of -20 and not give it root privilege?

I would like to start a process with a nice value of -20. This requires me to use a command like - sudo nice -n -20 matlab. However, this starts matlab as root too. Is there a way to have matlab as ...
0
votes
0answers
31 views

Pass process ownership to another shell [duplicate]

I didn't hear of anything like this, but It might be possible. I often end up starting a process on a server and midway realizing that I would like to suspend that process and continue it inside a ...
1
vote
1answer
236 views

Looking for /procfs documentation, describing values and units of measurement

Surprisingly, comprehensive documentation for /procfs is hard to find. For my specific question, I am looking at: cat /proc/1/statm (let's use pid=1 because it seems to be always there). I just ran ...
1
vote
2answers
127 views

Tracking which files are used by program

I am looking for a way to track which files are used by program installer(InstallAnywhere). I cannot use lsof because as far as I know it works on active processes and I want a tool which will work ...
2
votes
2answers
489 views

How to decrease ps aux output to a few lines?

When my computer is slowing down, I usually run ps aux --sort -rss to find out which process consumes too much memory. There may be a lot of processes. How to see only a few ones?
4
votes
4answers
60k 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 ...
2
votes
2answers
259 views

End process from another SSH window

I forgot to use screen and I have a task that has been running for quite some time, and I do not want to lose the saved data. Basically Ctrlc will end the task and save the data if I am on the same ...
0
votes
1answer
333 views

Move terminal emulator process from xorg to tty? [duplicate]

Is it possible (and if so, how?) to move a process from a terminal emulator running in X to a different virtual terminal, so that I can restart the X server without killing the process running in the ...
1
vote
2answers
2k views

How to watch pgrep?

When running a pgrep command with watch it does not only show the actual pgrep output, but also the watch process as well. Example: watch pgrep -lf donothing will show 3 processes, although ...
5
votes
2answers
2k views

Where is the virtual memory stored on hard drive?

If a process wants to access a memory address that is not in physical memory, the OS outsources a page frame from physical memory to the hard drive for later use. Where on the hard drive is this data /...
38
votes
8answers
13k views

Block network access of a process?

Is it possible to block the (outgoing) network access of a single process?
4
votes
4answers
8k views

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 ...
3
votes
2answers
7k views

How to know if a background job is finished?

I invoke a script (do_something) in background via another script (do_manythings) as below. nohup do_something & How would I know in the parent script (do_manythings) that the job invoked (...
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2answers
1k views

Invoke a command/script disconnected from the controlling terminal?

I'm investigating the behaviour of a script that is normally run as an automated process (e.g. cron, Jenkins). The script can (eventually) invoke commands that behave differently (seeking user input) ...