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Fetching Values from YAML and Passing Them to a Shell Script

Discover how to effortlessly fetch variable values from a YAML file and use them in your shell scripts for a seamless scripting experience. --- This video is based on the question https://stackoverflow.com/q/71393380/ asked by the user 'rowoc' ( https://stackoverflow.com/u/17248828/ ) and on the answer https://stackoverflow.com/a/71402938/ provided by the user 'Cole Tierney' ( https://stackoverflow.com/u/2820422/ ) 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: Fetch variables values from yml and pass to shell script? 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. --- Fetching Values from YAML and Passing Them to a Shell Script In today’s guide, we will explore a common problem that many developers face: how to retrieve variable values from a YAML file and use them in a shell script. As programming and automation become more intertwined, being able to pass configurations or data between files efficiently becomes crucial. Let’s dive into the solution step-by-step! Understanding the Problem You have a data.yml file containing some variables that you want your file.sh shell script to utilize. The original requirements are as follows: The data.yml file consists of variable names and their corresponding values. The shell script, when executed, should print a statement containing these variable values. To illustrate, your required output from the script would look like this: [[See Video to Reveal this Text or Code Snippet]] Preparing Your YAML File Your data.yml file might look like this: [[See Video to Reveal this Text or Code Snippet]] This file defines multiple variables, including count, name, and pass, which we will pull into our shell script. Crafting the Shell Script Next, we will create a shell script named file.sh. Here’s how it would be structured: [[See Video to Reveal this Text or Code Snippet]] Breakdown of the Shell Script Shebang: The script starts with # !/bin/bash, which tells the system to execute this script using the Bash shell. Reading Variables: A while loop reads every key-value pair from data.yml. yq is a command-line YAML processor that extracts the variables from the YAML file. The printf -v command is used to declare and initialize bash variables dynamically. Output Statements: The echo command prints the required details in a user-friendly format. Result When you execute file.sh, you will receive the following output: [[See Video to Reveal this Text or Code Snippet]] This implementation not only captures the initial requirement but also shows how to use additional variables for broader application contexts. Conclusion By following the method described above, you can effectively fetch values from a YAML file and seamlessly integrate them into your shell scripts. Automating this process allows for greater flexibility and less manual intervention in your development workflow. We hope this guide has made the concept clearer and provided you with practical knowledge to apply in your projects. Happy scripting!