I’ll introduce how to handle multi-line strings and newlines in GitHub Actions.

Prerequisite: Understanding the Risk of Script Injections

First, it’s assumed that you understand the GitHub Docs section on スクリプト インジェクションのリスクを理解する.

Solution: Handle Multi-line Strings and Newlines with Delimiters

You can handle multi-line strings and newlines using delimiters like EOF.

steps:
  - name: Set the value in bash
    id: multiline_strings
    run: |
      echo 'multiline_strings<> $GITHUB_ENV
      echo '1' >> $GITHUB_ENV
      echo '2' >> $GITHUB_ENV
      echo 'EOF' >> $GITHUB_ENV

For more details, please refer to the following pages:

• 複数行の文字列 - GitHub Actions のワークフロー コマンド - GitHub Docs
• github actions - How to fix or avoid Error: Unable to process file command 'output' successfully? - Stack Overflow

That’s all for using multi-line strings and newlines in GitHub Actions. That’s all from the Gemba.