advanced patterns with 'trap' command in Bash when handling SIGINT during a loop
I'm deploying to production and I'm working on a personal project and Hey everyone, I'm running into an issue that's driving me crazy. I've searched everywhere and can't find a clear answer... I'm working on a Bash script that processes a list of URLs in a loop, and I want to ensure that if the user interrupts the execution with `Ctrl+C`, the script cleans up temporary files before exiting. However, I'm running into an scenario where the cleanup function defined by `trap` is not executed when the script is interrupted. Here's the relevant portion of my script: ```bash #!/bin/bash # Function to clean up temporary files cleanup() { echo "Cleaning up..." rm -f /tmp/tempfile* } # Set up trap for SIGINT trap cleanup SIGINT # Loop through a list of URLs for url in "http://example.com/a" "http://example.com/b" "http://example.com/c"; do echo "Processing $url..." sleep 10 # Simulating a long-running process # Assume some processing happens here done echo "Done processing URLs." ``` When I run the script and hit `Ctrl+C`, it stops without executing the `cleanup` function. I expected it to output "Cleaning up..." before terminating. I've tried moving the `trap` command around and even placing the `cleanup` call directly after the loop, but it still doesn't seem to work. I'm using Bash version 5.0.17 on Ubuntu 20.04. Is there something I'm overlooking, or is there a particular reason why the `trap` might not be triggered in this case? Any insights would be appreciated! Any ideas what could be causing this? What's the best practice here? Any help would be greatly appreciated! The project is a web app built with Bash. I'm using Bash 3.9 in this project. Any ideas what could be causing this? I'd love to hear your thoughts on this.