Скачать или смотреть How to Compress Your Bash Script into a One-Liner

Learn how to easily compress a multi-line bash script into a concise one-liner, optimizing your code for efficiency and readability.
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This video is based on the question https://stackoverflow.com/q/71661313/ asked by the user 'mbxzxz' ( https://stackoverflow.com/u/8140238/ ) and on the answer https://stackoverflow.com/a/71663010/ provided by the user 'Ed Morton' ( https://stackoverflow.com/u/1745001/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Compress Your Bash Script into a One-Liner

When writing scripts in Bash, you might find the need to make your code more efficient and compact. Perhaps your multi-line script works perfectly fine, but it feels lengthy and can be streamlined. In this post, we'll tackle a common question: how to compress a Bash script into a single line?

The Original Script

Imagine you have a Bash script intended to retrieve Google Cloud Platform (GCP) region information and determine which Google Cloud Storage (GCS) bucket to use based on that region. Here's how your script looks in a formatted version:

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

Why Compress the Script?

There are several reasons you might want to compress your Bash script:

Improve Readability: For those familiar with the script, a single line may appear less cluttered.

Easier to Share: Sending a one-liner can be simpler than sharing multiple lines of code.

Quick Execution: When you run quick scripts from the command line, one-liners can often execute faster and require less typing.

Compression Process

Let's walk through the steps to compress the above script into a single line. The main considerations include removing unnecessary elements and simplifying the structure. Here's how to do it:

Remove the Shebang: The first line (# !/bin/bash) isn't necessary for a one-liner.

Insert Semicolons: Add a semicolon ; at the end of each non-empty line that doesn't end with ;; or in.

Join Lines Together: Combine the entire script into one line, ensuring proper spacing for readability.

Compressed Version

After following the steps above, you can transform the original script into a compressed one-liner like this:

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

Explanation of the One-Liner

set -xe;: Enables debugging and exits on errors, ensuring that if any command fails, the script will stop running.

GCP_REGION=: Fetches the GCP region using a curl command.

BUCKET_NAME="foo-bar-";: Initializes the bucket name variable.

case statement: Evaluates the region and appends the corresponding region suffix to the bucket name.

echo -n $BUCKET_NAME;: Outputs the final bucket name without adding a new line at the end.

Conclusion

While compressing a script into a single line can make it look tidier, it’s essential to maintain balance between compactness and readability. Always ensure that your code remains understandable both to yourself and to others who may read it later. Happy scripting!