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Questions tagged [background-process]

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A 'background' process is a computer process that runs "behind the scenes" (i.e. in the background) and without user intervention. Typical tasks for using such processes include logging, system monitoring, scheduling, and user notification. Use this tag for any questions about background processes.

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A semi-hypothetical question...i've logged into a machine remotely, set up a series of tasks along the lines of sleep 36000 ; source myjob1 & sleep 36000 ; source myjob2 & (etc.) and then ...
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I want to fzf through all the pdf files in a directory, open it and release the terminal. I tried PDF_READER=okular # or evince find -type f -name "*.pdf" -print | fzf --print0 | xargs -0 $...
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I use two graphical virtual terminals (sessions) on a debian desktop with KDE (the ones you switch between using chvt or Ctr-Alt-F7, F8, etc.). I notice that processes in open windows in the inactive ...
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Given this code: #!/bin/bash set -euo pipefail function someFn() { local input_string="$1" echo "$input_string start" sleep 3 echo "$input_string end" } function ...
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A borgmatic backup command that runs for many hours: long_running_cmd &> file.txt I did Strg+Z then bg then disown to keep the command running I case my laptop goes to sleep or disconnects. I ...
Destro's user avatar
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I have observed the following and want to understand why: First, I run a Node server that listens on a port on a remote server using: nohup my-app & Next there are two cases: I logout of the ...
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I have here a not really fine app, partially out of my control. Sometimes it stops and I want to restart it, and some extra options. So, if it exists, I want to start my script. Poor man solution ...
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I tried this simple test ping [SOME IP] &;ls expecting the output of ping to overlap with the listing. Instead, I got an error: bash: syntax error near unexpected token `;' It does not help ...
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When running a long-running command in the background over SSH from a non-interactive shell script, I noticed the process continues running on the remote machine without using nohup, disown, or ...
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I tested the following with both bash and dash, and it seems to reliably hang: [ -p pipe ] || mkfifo pipe i=0 while [ $i -lt 10 ]; do <pipe cat & : $(( i+=1 )) done # sleep 1 echo hello ...
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I am very new to linux and I need some help. I am trying to put blockchain node processes on the background so that they run without my being logged in. I am using systemctl to run my process in the ...
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Considering the following script: if [[ -z "$DOWNLOAD_ONLY" || "$DOWNLOAD_ONLY" = *conditions* ]]; then function get_condition { curl -s "https://conditions.com" | ...
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I have tried almost every solution on Stack Exchange (except for nohup; it seems like that is not an ideal loophole), but Systemd still kills my background processes. I also tried starting a Tmux ...
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I have a Debian 12 (bookworm) host where I run three VMs using QEMU / KVM. To simplify VM management, each VM has a QEMU monitor socket. These sockets are /vm/1.sock, /vm/2.sock and /vm/3.sock. Among ...
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I have root access to a Linux system and need to log processes without installing any additional software, using only built-in tools like top. However, I want the process to run in the background ...
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According to this answer to How to Hide PID and Exit Status When Running a Background Command in Terminal, using (some command &) one can stop the PID of the background process from appearing in a ...
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I don't understand why wait returns 127 in this case. According to man bash, this happens if the subprocess does not exist anymore. This seems to not be the case. This is the minimal example: #!/usr/...
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Consider the following script: rm -f /tmp/bar echo foo >/tmp/bar & tail -f < /tmp/bar When processing the echo line, does the shell first perform the redirect opening /tmp/bar for writing ...
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I have an array, a=(...), and a function, b {}, which takes an argument. I want to build a loop for i in ${a[@]} to traverse the values of a. In the loop, I use commands like (b $i) & to multitask....
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I would like to run the qemu vm that you see below runs between the processes,so I don't want to see any monitor,graphic,terminal window,nothing should be shown on the screen. /usr/local/bin/qemu-...
Marietto's user avatar
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I want to allow the leading program(s) to operate in a standard manner and detach from the terminal once a graphical application launches. In this example fzf reads paths from a file, feeds the ...
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before I explain my issue I should mention that I'm relatively new to Linux so please forgive my ignorance. I'm using an old Dell E10S to act as a dedicated Minecraft server.  I managed to install ...
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If I run ./script.sh &, where script is the following: #!/bin/bash echo "hello" sleep 30 echo "hello again" sleep 30 touch /root/foo.txt Then I use ps au, to identify the "...
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I have 1 service registered with systemd open_ssh.script autossh -M 0 -L 8080:127.0.0.1:8080 -i .ssh/id_rsa USER@HOST -fN auto_open_ssh.service [Unit] Description=SSH Tunnel Service After=network....
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When I run the command in the terminal: sudo badvpn-tun2socks --tundev tun0 --netif-ipaddr 10.0.0.2 --netif-netmask 255.255.255.0 --socks-server-addr 127.0.0.1:8080 I get a terminal with packet data ...
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I want to run two shell scripts after each other, in the background, preferably also using nohup. I start with % nohup a.sh & This runs a in the background. % nohup a.sh && nohup b.sh ...
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In a shell script, I am trying to start a background command that has the same stdin as that of the shell script. #!/bin/sh # ... the-program & However, the-program above will not have access to ...
Flux's user avatar
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I would like to open a PDF with evince from the command line and after the Evince window pops up, I want to go back to the terminal command with $ already waiting for the next command. Now if I run ...
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I was experimenting with ssh, nohup, bg etc. I started a tail process in remote using $ ssh remotehost '{ nohup tail -f ut.log &> /dev/null < /dev/null &} && echo $!' It ...
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I'm trying to write a quick-and-dirty shell script daemon to run on a home router that has a busybox shell, which doesn't support disown. Is there any way to do either of the following? Run a command ...
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I execute a long running Python-process. To stop the annoying noise from the fans I use AppPolice to prevent this process from using more than 20 % CPU (I don't care when it finishes). I think that ...
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So as an example if I run: sleep 1 & sleep 2 & sleep 3 I will immediately get the process IDs e.g. [1] ... [2] ... and then the shell freezes until the sleep 3 finishes running and then ...
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I am trying to get a background process to print to the terminal. I haven't seen anything that otherwise indicates there is anything else to do besides stty -tostop. Am I missing something? Running ...
Sterling Butters's user avatar
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As far as I've seen, pressing Ctrl-Z on any terminal multiplexer, or trying to start them in the background, does nothing or crashes. I know that, in a sense, terminal multiplexers are a "...
Sebastian Carlos's user avatar
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I want the exact opposite of this question. I want to know how I can create a process that keeps restarting if it's killed. Could someone give me an implementation example? For instance, let's assume ...
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The home directory of user bob is mounted by a superuser from elsewhere. bob himself is a sudoer, he is logged in and is happily using his mounted home directory. He finishes his work and wants to run ...
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"Yes, and..." is a wonderful rule-of-thumb in improvisational comedy. Not so much in the UNIX world. When I run the admittedly silly yes& command, I cannot interrupt it. The terminal ...
Sebastian Carlos's user avatar
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I have a systemd service which spawns an ffmpeg process any time it detects a new event. These processes are meant to survive and run to completion even if the service is restarted (hence them being ...
plunker's user avatar
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I am using ubuntu Jammy release and on my system port no 3306 is unusable since I tried ssh based port forwarding on the same to a different machine. Also while running ps -aux it shows a strage ...
Gautam's user avatar
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I was checking possibilities of pid leaks about a bash script which continuously create background jobs yet not call wait command, I happened found (by strace) that Bash monitors SIGCHLD and ...
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I run a lot of vim windows, and often put them in the bg. The problem is that they all say vim when I list jobs so it's hard to distinguish. [1] - suspended nvim [2] - suspended nvim [3] + ...
pixelearth's user avatar
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My OS is AIX (7.2) and my shell is ksh88 (preferably) or ksh93, if necessary. I want to write a script that sets some maximum timer for its execution. If it manages to finish its task within this time ...
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Spec According to this online POSIX Spec, in Shell & Utilities, Shell Command Language, Section 2.9.3 Lists has the following to say about Asynchronous Lists: When an element of an asynchronous ...
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If I just run sleep 1 & in bash, the sleep process will get reaped almost instantly after it dies. This happens whether job control is enabled or disabled. Is there a way I can make bash hold off ...
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If I do: sleep 1 versus sleep 1 & wait $! will there be any difference in terms of CPU usage for spawning a foreground process versus a background process? Or will the performance of both lines ...
Maestro's user avatar
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Currently I do: while [ -d "/proc/$PID" ]; do sleep 1 done To wait for a process to exit. If I would replace it with: tail --pid=$PID -f /dev/null Would that be more efficient for the ...
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From a bash script, I need to start three processes and put to each of these processes a name, in order to be able to stop them in a later stop command. # Démarrer les applications eco emploi : ...
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After pausing the process with Ctrl+Z, I attempted to send it to background with the bg command.  Unfortunately, the process isn't sent to the background, and reappear to be running foreground.  Then, ...
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I used ssh to start a dotnet app as background job on a remote server dotnet MyApp.dll & I confirmed, that the app was running and then terminated the ssh session. Now I want to kill this ...
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I'm interested in Linux specifically, but an answer for other Unices would be great as well: Does the system have a way of signaling to a process that it's been launched in the background? In other ...
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