Error Handling and Logging in Scripts
Implement robust error handling, redirect script output, and generate meaningful logs to monitor script execution and troubleshoot issues.
Make Your Scripts Reliable
Imagine your script running on a server, doing important work. What happens if something goes wrong?
- Does it fail silently?
- Does it leave a mess behind?
- Can you tell when and why it failed?
Robust scripts handle errors gracefully and provide clear logs. This lesson teaches you how!
Understanding Exit Codes
Every command and script in Linux returns an exit code (or exit status) when it finishes. This number tells you if it succeeded or failed.
0: Means success! Everything went well.1-255: Means failure. A specific number might indicate the type of error.
Let's see this in action:
#!/bin/bash
# This script demonstrates exit codes
echo "Attempting a successful command..."
ls /tmp
echo "Exit code for 'ls /tmp': $?"
echo
echo "Attempting a failing command..."
ls /nonexistent_directory
echo "Exit code for 'ls /nonexistent_directory': $?"All lessons in this course
- Introduction to Bash Scripting
- Automating Server Tasks
- Error Handling and Logging in Scripts
- Functions, Arguments, and Reusable Scripts