Скачать или смотреть How to Make Your Batch Script Stop Execution on Errors Easily

Learn how to ensure your Windows batch file stops running when an error occurs with effective error checking techniques.
---
This video is based on the question https://stackoverflow.com/q/74759031/ asked by the user 'Alexey Starinsky' ( https://stackoverflow.com/u/9261322/ ) and on the answer https://stackoverflow.com/a/74759244/ provided by the user 'Jonathan' ( https://stackoverflow.com/u/552510/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to make the script stop execution when an error occurres

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Stop Your Batch Script from Running on Errors - A Guide

If you've ever worked on a batch file in Windows, you know that things can sometimes go awry. From missing directories to failed commands, errors can slow down your workflow or, worse, lead to incomplete builds. But what if there was a way to make your script stop execution when an error occurs? In this post, we’ll explore how to implement effective error handling in your batch scripts.

Understanding the Problem

In a typical batch script, you might have a series of commands that are executed in sequence. However, if one of those commands fails (for instance, a build command), the script could continue running, leading to unforeseen issues. You want your batch script to halt whenever an error is encountered.

Common Scenarios for Errors

Directory Not Exists: Attempting to change to a directory that does not exist can throw an error that needs to be caught.

Command Failures: Functions like cmake can fail for various reasons, and you do not want subsequent commands to execute in such cases.

The Solution: Error Checking

To handle such errors, you need to incorporate error checking mechanisms into your script. Here’s how you can do it step by step.

Step-by-Step Implementation

Use setlocal EnableDelayedExpansion:
This command allows you to use ! for command expansion, which is crucial for error level checking.

[[See Video to Reveal this Text or Code Snippet]]

Check for Each Command:
After each critical command, check for an error using the following structure:

[[See Video to Reveal this Text or Code Snippet]]

Utilize the Short-hand Method:
An even more concise syntax is using the "short-circuit" operator ||, which is a great way to simplify your script. It looks like this:

[[See Video to Reveal this Text or Code Snippet]]

Key Points to Remember

Always use !ERRORLEVEL! when checking error codes, as %ERRORLEVEL% can be expanded too early in the script execution.

Ensure that setlocal EnabledDelayedExpansion is the first command in your script if you want to use ! for error level checking.

It's a best practice to log error messages or display them so you know what went wrong during execution.

Example: Applying It All Together

Here’s an adapted version of your initial script incorporating error checking:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By implementing error checks in your batch scripts, you can significantly reduce the risk of proceeding with erroneous commands, ensuring your builds run smoothly. Remember that simple checks can go a long way and that practicing good error management is key to maintaining efficient workflows.

Now go ahead and enhance your scripts with this knowledge, making sure your automation runs without a hitch!