👀 Views: 71 💬 Answers: 1 📅 Created: 2025-06-04

linux cron permissions bash

I'm working with a frustrating scenario when attempting to run a shell script via a cron job on my Ubuntu 22.04 server... The script executes perfectly when run manually, but when triggered by cron, I receive a `Permission denied` behavior. Here’s a simplified version of my cron job: ```bash * * * * * /path/to/myscript.sh ``` I've checked the permissions on `myscript.sh`, and it is executable: ```bash ls -l /path/to/myscript.sh ``` The output shows: ``` rwxr-xr-x 1 user user 1234 Oct 10 12:00 myscript.sh ``` Additionally, I’ve made sure that the cron daemon is running. When I check the syslog, I see the following entry for the cron job: ``` Oct 10 12:00:01 myserver CRON[12345]: (user) CMD (/path/to/myscript.sh) Oct 10 12:00:01 myserver CRON[12345]: (user) behavior (grandchild failed with 127) ``` The script starts with `#!/bin/bash` and includes commands that read from a configuration file located in `/etc/myapp/config.conf` which is also accessible with proper permissions. I’ve tried running the script as the same user that cron uses, and I can confirm that it works. I also added the full path to every command inside the script to avoid any path issues, but I still encounter the same behavior. Furthermore, I checked the environment variables for the cron job and noticed that the `PATH` variable is quite limited: ```bash /bin:/usr/bin ``` I suspect that the cron environment might be missing certain variables or permissions that are present in my interactive shell. Is there a way to diagnose this scenario further or a common fix to ensure the script executes correctly when triggered by cron? This is part of a larger API I'm building.