Template Variables Test

This document tests various template variable syntaxes used in different languages and tools.

Shell/Bash Variables

Set the path with $HOME/projects or ${HOME}/projects.

Use ${VAR_NAME} for variable expansion.

Default values: ${VAR:-default} or ${VAR:=default}

String operations: ${VAR#pattern} and ${VAR%pattern}

Configure with $DATABASE_URL for the connection string.

The $NODE_ENV should be “production” or “development”.

AWS credentials: $AWS_ACCESS_KEY_ID and $AWS_SECRET_ACCESS_KEY

In JavaScript, use ${variable} inside backticks for interpolation.

Example: Hello, ${user.name}! You have ${count} messages.

Expressions work too: Total: ${price * quantity}

Use {{variable}} for Mustache templates.

Sections: {{#items}}…{{/items}}

Inverted sections: {{^items}}No items{{/items}}

Partials: {{> partial_name}}

Variables: {{ variable }}

Filters: {{ name|lower }}

Tags: {% if condition %}…{% endif %}

Comments: {# This is a comment #}

Output: <%= expression %>

Execute: <% code %>

Comment: <%# comment %>

Reference: ${var.region}

Local: ${local.name}

Data: ${data.aws_ami.id}

Values: {{ .Values.image.repository }}

Release: {{ .Release.Name }}

Chart: {{ .Chart.Version }}

Secrets: ${{ secrets.GITHUB_TOKEN }}

Context: ${{ github.repository }}

Expressions: ${{ steps.step_id.outputs.result }}

A complex template might have ${shell} and {{mustache}} and {simple} all together.

Or even {{ jinja }} with ${bash} in the same document.