just installieren: justfile schreiben, Recipes starten, Vergleich mit make

just, justfile, Recipes — wann statt Makefile.

Jedes Repo wiederholt lint/test/build — just hält Recipes in einer justfile. Dieser Leitfaden: the same dance—lint, test, build—buried in a README or locked inside language-specific scripts. just is a command runner by Casey Rodarmor: drop a justfile at the root, name recipes, and run them with just. Syntax is gentler than Make, and cross-platform setup is usually simpler. Installation macOS/Linux, justfile schreiben, Recipes ausführen, Vergleich mit make für hereink.

The query is how to install just command runner write justfile run recipes compare to make. You should finish with just installed, a first recipe, just --list for discovery, and a clear sense of when just beats a Makefile.

Was just löst

Upstream: github.com/casey/just, docs at just.systems. Run just --version after install.

just installieren

1. 1
   macOS (Homebrew)

   brew install just. Verify with which just and just --version.

2. 2
   Linux (distro packages)

   Arch: sudo pacman -S just. On Debian/Ubuntu if packages lag, use cargo install just or official prebuilt binaries from the install page on just.systems.

3. 3
   Rust toolchain

   With Rust installed: cargo install just. Keep ~/.cargo/bin on your PATH.

4. 4
   Version managers

   mise use -g just@latest, or asdf’s just plugin if your team already standardizes on mise/asdf.

justfile schreiben

Create justfile (or .justfile) at the repo root. Minimal starter:

default:
    just --list

# Run unit tests
test:
    cargo test

check: lint test
    echo "all green"

lint:
    cargo clippy -- -D warnings

Syntax highlights:

• Recipe names: name: then indented commands (spaces, not tabs).
• Parameters: deploy env: and use {{env}} in the body.
• Variables: top-level port := "3000", reference as {{port}}.
• Shebang recipes: start with #!/usr/bin/env bash for multi-line shell.

port := "8080"

serve:
    python -m http.server {{port}}

greet name="world":
    echo "hello {{name}}"

Recipes ausführen

cd ~/projects/my-app
just --list
just test
just check
just greet Alice
just

just searches upward for a justfile. Override with just --justfile path/to/justfile recipe. Use -n / --dry-run to print commands without executing.

just vs make

Passt für just

Unified test / lint / dev entrypoints; polyglot repos; readable task lists outside npm or poetry scripts.

Bei make bleiben

C/C++ incremental compiles, heavy dependency graphs, or a mature Makefile the team already trusts.