Bash script not capturing output of background process correctly
I've been banging my head against this for hours. Quick question that's been bugging me - I'm having trouble with a bash script that is intended to run a long background process and capture its output to a log file. The script runs the command but instead of capturing the output, the log file remains empty. Here's a simplified version of my script: ```bash #!/bin/bash log_file="process.log" # Start the background process long_running_command > $log_file 2>&1 & # Wait for the background process to finish wait # Check the output cat $log_file ``` I've confirmed that `long_running_command` does produce output, as running it in the foreground displays the expected output in the terminal. However, when it's executed in the background, the log file doesn't seem to capture any of it. I have tried various combinations of redirections and even manually checking the process list to ensure the command is running, but the log file remains empty. One thing I noticed is that when I run the script, a warning appears: "Warning: Unable to find process for PID..." I'm using Bash version 5.1.4 on Ubuntu 20.04. Could this be related to how the output is being redirected, or is there another underlying scenario at play? Any insights or solutions would be greatly appreciated! I'd really appreciate any guidance on this. I'm working on a web app that needs to handle this. Any help would be greatly appreciated!