just — command runner

💬 "just command"

just is a command runner that manages project-specific commands with a justfile. It is an alternative to makefile.

It executes commands defined in the justfile. It defines commands without the unnecessary tab rules of makefile.

• Concept: Executes commands defined in the justfile.
• Key Features: Defines commands without the unnecessary tab rules of makefile.
• Advantages: Consolidates development, deployment, and testing commands into a single file.
• Usage: Allows defining dependencies between commands.

Installation and Download

just can be installed via a package manager or an official script.

Installation can be verified with just --version.

Commonly Used Options

Three Essential Command Combinations

• just --list — Check command list of current project
• just build — Execute build recipe
• just --summary | tr ' ' '\n' — List recipe names one per line

💬 "Show me an example of using just on a real server"

I've organized common situations encountered on real servers in order.

Step 1 · Installation Check

Check if it's installed.

just --version || sudo apt install -y just

Step 2 · Create justfile

Create a justfile in the project root.

printf 'build:\n    python3 build.py\n\ndeploy:\n    ./deploy.sh\n' > justfile

Step 3 · Check list and execute

Check the defined recipes and execute them.

just --list && just build

Real Execution Screen

This is the result after creating the justfile and checking the recipe list.

!just command execution result

Real server in operation

In Practice, It's Used Like This

1. Organize Project Commands

Situation — Consolidate multiple deploy scripts into a justfile.

just --list

Result — build, deploy, test, etc., are gathered in one place.

Point — Team members don't need to memorize commands.

2. Execute Dependencies

Situation — Make deploy run automatically after build.

just deploy

Result — build runs first.

Point — No chance of messing up the order.

Real Execution Screen

This is the result after executing the deploy recipe with just.

!just command execution result 2

Real server in operation

Cautions

• justfile recipes can be indented with spaces instead of tabs.
• just passes environment variables as-is.
• When used with makefile, be careful not to overlap command names.
• Check what commands are available in the current project with just --list.

Source (HTML): https://games.aidebatehub.com/programs/linux/modern/just.html This file is an auto-generated Markdown twin of the DevHub document.