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30 lines
1.1 KiB
Markdown
30 lines
1.1 KiB
Markdown
---
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title: "Handling Background Processes in Bash"
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date: 2019-06-17T19:50:30-04:00
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draft: false
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tags: [ "Bash" ]
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medium_enabled: true
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---
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For multi-process applications, I want to be able to start it up using the `bash` command processor and be able to stop all the processes just by hitting `CTRL-C`.
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As a quick reminder, to have a task run in the background you need to add a `&` at the end of the line.
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```bash
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execute_app &
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```
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Previously, I was grabbing the PID of this background process, trapping the interrupt signal and taking the time to send the interrupt signal to all of the background processes.
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You can get the child pid by referencing the variable `$!` after sending a process to the background.
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Now I just use `setsid` to set the process group of the background processes to be the same as the bash process itself. The following demo script here will show the capability.
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```bash
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#!/bin/bash
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setsid sleep 5 &
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setsid sleep 10 &
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wait
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```
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This script will send two processes to the background and will wait until all the processes are finished. Hitting `CTRL-C` during execution will send the interrupt signal to all of the processes achieving my goal.
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