Unix and Linux Stack Exchange
Unix and Linux Stack Exchange

Questions tagged [processes]

47 questions
42
votes
5 answers

I am using `&`: why isn't the process running in the background?

I know that I can append & to a command to run the process in the background. I'm SSH'ing into an Ubuntu 12.04 box and running a python program with $python program.py & -- but when I go to close the terminal window I get a message saying that…
bernie2436
  • 6,505
  • 22
  • 58
  • 69
25
votes
4 answers

Processes in background without “&”

Let’s say you started a new application in Linux (like a text editor, etc.), but you forgot to use the “&”. What command(s) would you use in order to make that process run in the background, while NOT having to CLOSE that application? In this way,…
D0uble7
  • 359
  • 3
  • 3
13
votes
1 answer

How to find processes using serial port

I'm using uclinux and I want to find out which processes are using the serial port. The problem is that I have no lsof or fuser. Is there any other way I can get this information?
Kermit the Hermit
  • 233
  • 1
  • 2
  • 6
11
votes
4 answers

What is an open file description?

When you fork a process, the child inherits its parent's file descriptors. I understand that when this happens, the child receives a copy of the parent's file descriptor table with the pointers in each pointing to the same open file description. Is…
user68207
10
votes
4 answers

Is is possible to copy a running process between machines?

To the best of my understanding, all linux process are actually files, is it possible to copy a running process from one machine to another? for example - copy a running tomcat server from one machine to another without having to restart the server
aviad m
  • 123
  • 1
  • 5
6
votes
1 answer

lsof misses files

Why does lsof fail to list files I have open. For example I open with the text editor some file in my home directory. $ gedit ~/.python_history lsof does not even work as root $ sudo lsof | grep python_history does not list anything. Why? Editing…
sdgsrg
  • 61
  • 1
5
votes
3 answers

Get the terminal emulator name inside the shell script

I have used pstree to find the name of the parent emulator of running shell script using something similar to the following: pstree -s $PPID | awk -F '---' '{print $6}' This works in my current system. I tested in mate-terminal and xterm but not…
Vombat
  • 12,654
  • 13
  • 44
  • 58
4
votes
1 answer

List loaded libraries of a process on FreeBSD

How can I list all loaded libraries of a process in FreeBSD? On Linux I can use /proc cat /proc/$pid/maps on Solaris there is pldd pldd $pid For FreeBSD /proc also works: cat /proc/$pid/map however, /proc is not mounted by default. As this is…
Thomas Erker
  • 2,777
  • 12
  • 19
3
votes
3 answers

How to list all linux processes that had any network activity during some period of time (past or future)?

I'd like to know which processes use the network: To inspect if any unknown to me (and potentially malicious) programs on my system use the network; To learn the amount of network traffic by the process, and further broken down by protocol HTTP,…
latgarf
  • 131
  • 3
3
votes
2 answers

Expect script: How to handle two processes?

I am using Expect to automate VoIP calls for quality measurements. My script is calling another VoIP client for a given amount of times. Before the calls should be handled, tcpdump should sniff all the packets. While tcpdump occupies the terminal,…
timolemow
  • 63
  • 1
  • 5
3
votes
2 answers

how to get info about the user and the processes he is running in systemd?

If I wanted to know who is logged in since when and what are the processes currently running under his control, how can I do that in systemd?
drpaneas
  • 2,222
  • 8
  • 25
  • 35
2
votes
1 answer

Find out what process accesses file/device

The external hard disks attached to my Raspberry Pi spin up seemingly randomly and I don't know why. They form a RAID 1 managed by mdadm whose only partition is formatted with ext4. Today, I set up a screen running $ while true; do inotifywait -r…
UTF-8
  • 3,175
  • 5
  • 23
  • 50
2
votes
2 answers

dbus-launch and dbus-daemon - what's happening

I grepped the ps output for dbus with the following output: 102 742 0.0 0.0 4044 1480 ? Ss Apr16 27:13 dbus-daemon --system --fork --activation=upstart xralf 2551 0.0 0.0 4076 212 ? Ss Apr16 0:14…
xralf
  • 16,149
  • 29
  • 101
  • 149
2
votes
2 answers

Investigating problematic processes

When a command or process seems to hang, freeze, crash, or whatever; is there a way to investigate exactly what it's currently doing (if anything), behind the scenes? Would be especially useful to determine if it's crashed, or if it's just carrying…
voices
  • 1,252
  • 3
  • 15
  • 30
2
votes
1 answer

Is the coordination overhead between two processes significant?

I have 24 compute intensive processes, each process running in a single thread, each running about 2 hours. I'm on a 8 core CPU. Does it make a difference on the total run time, if I run all 24 processes at the same time in contrast to running only…
lukstei
  • 141
  • 1
  • 3
1
2 3 4