An instance of a running computer program.

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123
votes
9answers
68k views

Keeping a linux process running after I logout

I'm connecting to a Linux machine through SSH, and I'm trying to run a heavy bash script that makes filesystem operations. It's expected to keep running for hours, but I cannot leave the SSH session ...
105
votes
9answers
53k views

Environment variables of a running process on Unix?

I need to troubleshoot some problems related to environment variables on a Unix system. On Windows, I can use a tool such as ProcessExplorer to select particular a process and view values of each ...
41
votes
6answers
8k views

How to prevent “ps” reporting its own process?

$ ps | grep django 28006 ttys004 0:01.12 /usr/bin/python bin/django celeryd --beat 51393 ttys005 0:01.45 /usr/bin/python bin/django celeryd -l INFO 51472 ttys005 0:01.29 /usr/bin/python ...
39
votes
3answers
22k views

Show full process name in top

I'm running a rails stack on ubuntu. When I ps -AF, I get a descriptive process name set by the apache module like 00:00:43 Rails: /var/www... which is really helpful in diagnosing load issues. ...
32
votes
4answers
33k views

How to sort ps output by process start time?

Is there a way to sort ps output by process start time, so newest are either at the top or bottom ? On Linux ? On SysV5 ? On Mac ?
26
votes
5answers
4k views

What is svchost and why are multiple instances of it running?

There's six instances running on my desktop, and probably ten on a server I manage. What is this, and is it vital to system function?
26
votes
5answers
68k views

How do you free up a port being held open by dead process?

A colleague of mine recently ran into a problem where a process that had supposedly died was still bound to a network port, preventing other processes from binding to that port. Specifically, netstat ...
25
votes
5answers
33k views

how i can identify which process is making UDP traffic on linux?

my machine is continously making udp dns traffic request. what i need to know is the PID of the process generating this traffic. The normal way in TCP connection is to use netstat/lsof and get the ...
24
votes
5answers
48k views

How to get pid of just started process

I want to start process (eg. myCommand) and get its pid (to allow to kill it later). I tried ps and filter by name, but I can not distinguish process by names myCommand ps ux | awk ...
23
votes
6answers
57k views

Dump a linux process's memory to file

Is it possible to dump the current memory allocated for a process (by PID) to a file? Or read it somehow?
21
votes
6answers
20k views

If I launch a background process and then log out, will it continue to run?

Asking this after a prolonged discussion with a coworker, I'd really like a clarification here. I launch a background process, either by appending "&" to the command line or by stopping it with ...
17
votes
9answers
1k views

Documentation As-A-Manual vs. Documentation As-A-Checklist

I've had discussions in the past with other people in my department about documentation, specifically, level-of-detail and requirements. In their view, documentation is a simple checklist of Y things ...
17
votes
5answers
17k views

Set max file limit on a running process

I have a long running process that is eventually going to hit the max open file limit. I know how to change that after it fails, but is there a way to change that for the running process, from the ...
15
votes
2answers
2k views

Linux/Debian - What does 'pee' in moreutils do?

I recently discovered the 'moreutils' package in Debian (and Ubuntu). It's a collection of convenient unix tools. One of the commands is 'pee'. The man page says: pee is like tee but for pipes. ...
15
votes
3answers
22k views

How to get - number of threads per process?

This is one Ubuntu 9.10 server. Also how to see memory usage per process? Thanks
14
votes
4answers
6k views

Do background processes get a SIGHUP when logging off?

This is a followup to this question. I've run some more tests; looks like it really doesn't matter if this is done at the physical console or via SSH, neither does this happen only with SCP; I also ...
13
votes
5answers
5k views

Linux - How do I see when a process started?

How can I see when a process started, assuming I know the pid. (On Linux)
13
votes
4answers
32k views

Is there an equivalent command for 'init.d/networking restart' in OS X

From time to time, I've encountered issues with OS X clients' network connections (Wired and Wireless, Leopard/Snow Leopard) where nothing will fix the issue, until you reboot. Is there a ...
12
votes
6answers
12k views

How do I log CPU usage per process?

I have a box on Linode that's going through weird behavior. Every now and then CPU and disk I/O will shoot to 100% and the server becomes unresponsive and has to be booted. I'd like to investigate ...
11
votes
3answers
8k views

How do I start a process in suspended state under Linux?

Practically, I need a process which behaves, as if I had pressed Ctrl+Z just after it started. Hopefully, it is possible to do such thing using a shell script. (Also, knowing the resulting PID would ...
11
votes
2answers
11k views

Windows 7 or Server 2008 Show running time for a Process

Is there any simple way to show how long a specific PID instance has been active?
11
votes
2answers
5k views

Linux - Find out the current working directory of a process?

If i have a process PID X, how can I find out what directory it was running in? I can see with ps aux | grep X the full command line that it was invoked with. However in this case it's ./script.sh, ...
11
votes
1answer
7k views

Putting a process in the background without stopping it - (ctrl+z)?

If I start a process by typing it in normally at the command line, such as wget http://site.com/bigfile.zip and then decide I want to move that to the background, I know that I can use something ...
9
votes
5answers
4k views

Kill a process and force it to return 0 in Linux?

In the Linux environment, how can I send a kill signal to a process, while making sure that the exit code returned from that process is 0? Would I have to do some fancy GDB magic for this, or is there ...
9
votes
5answers
54k views

How to measure solaris process memory usage?

How to check how much memory a solaris process consumes? I'd like both total address space allocated and the amount that is resident in RAM. I tried summing pmap output with some awk script, but it ...
9
votes
2answers
5k views

Upstart : start service after non-upstart process

On Ubuntu 10.04, I need to start my service with upstart, but only when mysql is up and running. The problem is that mysql itself is not handled by upstart, so I can't use the "start on" feature. ...
9
votes
5answers
3k views

Limiting network throughput of an already launched process ? (Linux/FreeBSD)

Is there any utility to limit the network throughput of a process after it has been launched? Simple example: you note that a user takes all your upload bandwidth using scp and you'd like to limit the ...
8
votes
5answers
3k views

Pain removing a perl rootkit

So, we host a geoservice webserver thing at the office. Someone apparently broke into this box (probably via ftp or ssh), and put some kind of irc-managed rootkit thing. Now I'm trying to clean the ...
8
votes
4answers
30k views

How do you kill a process tree in linux? [closed]

Sometimes, sending a SIGTERM to a process will cause it to send SIGTERM to all its child processes. However, sometimes this doesn't work. Is there a command or a utility that will allow me to kill a ...
8
votes
5answers
6k views

Are .pid files reliable for determining whether a process is running?

Many programs such as sshd create .pid files in /var/run/ that contain their process ID. Are these files reliable for determining whether a process is running? My guess is that these files are ...
8
votes
6answers
12k views

How do I track CPU Utilization for Window Services?

I am using the windows task manager to track CPU utilization. I notice that my applications are listed but Windows Services are not. For instance, total CPU usage is listed at 70% but the summary of ...
8
votes
4answers
16k views

What's a proper way of checking if a PID is running?

I have a .pid file, and I need to check if the process is running. So far I found two options kill -0 `cat something.pid` which prints out an error if the pid isn't running. I know this can be ...
7
votes
8answers
6k views

How to detect a hidden process in linux?

We have a box we suspect has been rooted at work. The question is how do we find it? I am no system administrator, but I was brought onto the team to resolve the situation and I am curious where ...
7
votes
6answers
2k views

What is the best way to identify unknown processes on windows?

How do you typically identify processes in windows' task manager when trouble shooting a problematic system? It's easy enough to get a list of tasks via the task manager but how do you determine ...
7
votes
5answers
4k views

Bash snippet for killing a process until it's dead?

I'm trying to write a robust bash script, and in it I create a background process. At the end of the script, I want to kill it. I have it's PID. I was thinking of somthing like this while [[ ps ef ...
7
votes
3answers
3k views

Supervisor VS cronjob

Actually I'm using supervisor to monitor a process and restart it when it stops for some reason. The problem is that in case of a supervisor crash the process stops get monitored. So I thought to ...
7
votes
2answers
34k views

What is a Process Handle?

What is a process handle and what can we know about a running process through the "handle count" property in a task explorer?
7
votes
5answers
5k views

how to get process file name from PID in MacOS?

Is it possible to get a file name of a process using PID? ps displays a lot of useful information about a process, but not a hint about a process executable file location.
7
votes
1answer
2k views

Verify disown command

I issued the ^z; bg; disown sequence in order to allow me to close an ssh session in which I am running a super-important long-running process. This process writes status output to stderr, and it has ...
7
votes
3answers
6k views

Monitor all newly spawned processes on a Linux machine

Sometimes a process comes and goes faster than I can ps aux, I tried watch -d -n0.1 "ps aux | tail" but again, that's restricted to 1/10th of a second. What I really want is to run a command and ...
7
votes
7answers
25k views

How to kill a <defunct> process with parent 1

I am running Bacula on a RedHat box. From time to time, the storage daemon bacula-sd stops working and becomes <defunct>. [root@backup ~]# ps -ef | grep defunct | more root 4801 29261 0 ...
7
votes
3answers
5k views

How can I redirect an already running process's stdout/stderr?

(Running on an Ubuntu 10.04 64-bit server) Yesterday, I made the mistake of starting a process (which I didn't realize was going to take several days to run) over SSH without using screen. I've ...
7
votes
3answers
242 views

How to safeguard a shell script against running out of control?

I've recently had an experience of writing a shell script which crashed a server (and damaged a partition) by consuming all resources. It was hooked up to a cron job, and it seems it took longer to ...
7
votes
1answer
3k views

App Pool doesn't respect memory limits

I am dealing with a legacy .NET app that has a memory leak. In order to try and mitigate a run away memory situation, I've set the app pool memory limits from anywhere between 500KB to 500000KB ...
6
votes
14answers
19k views

How do I kill processes older than “t”?

First, yes I have seen this question: http://serverfault.com/q/71360/14428 The answers there are incorrect and do not work. I have voted and commented accordingly. The processes I want to kill look ...
6
votes
2answers
5k views

Determine process using a port, without sudo

I'd like to find out which process (in particular, the process id) is using a given port. The one catch is, I don't want to use sudo, nor am I logged in as root. The processes I want this to work for ...
6
votes
2answers
4k views

top in batch mode, need CPU% for every core

I know that after running top, I can press '1' and get a list of the CPUs with their utilization percentages. I suspect I can do this in batch mode too with the -b option, but I don't know how, and I ...
6
votes
6answers
10k views

Find (and kill) old processes

Basically I need to be able scan the process tree and find processes that match a certain name and started running more than a week a go. Once I have them, I need to kill them. All the processes are ...
6
votes
3answers
782 views

Does anyone know a simple way to monitor root process spawn

I want to exec a script when a new root process spawns. (on Linux) How can I simply do that ? Thanks
5
votes
3answers
13k views

Best way to kill Zombie and D state processes in linux

What is the best way to kill Zombie processes and D state process by single command.