Table of Contents

Introduction

In this quickstart guide, we'll install Composer on an Ubuntu 20.04 server.

For a more detailed version of this tutorial, with more explanations of each step, please refer to How To Install and Use Composer on Ubuntu 20.04.

Prerequisites

install illustration for: Prerequisites

To follow this guide, you'll need access to an Ubuntu 20.04 server as a sudo user.

Step 1 — Install Dependencies

Start by updating your package manager cache and installing the required dependencies, including php-cli:

				
					sudo apt update
sudo apt install php-cli unzip

Step 2 — Download and Install Composer

Make sure you're in your home directory, then retrieve the Composer installer using curl:

				
					cd ~
curl -sS https://getcomposer.org/installer -o /tmp/composer-setup.php

Next, we'll verify that the downloaded installer matches the SHA-384 hash for the latest installer found on the Composer Public Keys / Signatures page.

Using curl, fetch the latest signature and store it in a shell variable:

				
					HASH=`curl -sS https://composer.github.io/installer.sig`

Now execute the following PHP code to verify that the installation script is safe to run:

				
					php -r "if (hash_file('SHA384', '/tmp/composer-setup.php') === '$HASH') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"

You'll see the following output:

				
					[label Output]
Installer verified

Note: If the output says Installer corrupt, you’ll need to repeat the download and verification process until you have a verified installer.

The following command will download and install Composer as a system-wide command named composer, under /usr/local/bin:

				
					sudo php /tmp/composer-setup.php --install-dir=<^>/usr/local/bin<^> --filename=<^>composer<^>

You'll see output similar to this:

				
					[secondary_label Output]
All settings correct for using Composer
Downloading...

Composer (version 2.2.9) successfully installed to: /usr/local/bin/composer
Use it: php /usr/local/bin/composer

To test your installation, run:

				
					composer
				
			
				
					[secondary_label Output]
 ______
 / ____/___ ____ ___ ____ ____ ________ _____
 / / / __ \/ __ `__ \/ __ \/ __ \/ ___/ _ \/ ___/
/ /___/ /_/ / / / / / / /_/ / /_/ (__ ) __/ /
\____/\____/_/ /_/ /_/ .___/\____/____/\___/_/
 /_/
Composer version 2.2.9 2022-03-15 22:13:37

Usage:
 command [options] [arguments]

Options:
 -h, --help Display this help message
 -q, --quiet Do not output any message
 -V, --version Display this application version
 --ansi Force ANSI output
 --no-ansi Disable ANSI output
 -n, --no-interaction Do not ask any interactive question
 --profile Display timing and memory usage information
 --no-plugins Whether to disable plugins.
 -d, --working-dir=WORKING-DIR If specified, use the given directory as working directory.
 --no-cache Prevent use of the cache
 -v|vv|vvv, --verbose Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug
...

This verifies that Composer was successfully installed on your system and is available system-wide.

Related Tutorials

Here are links to more detailed guides related to this tutorial:

https://www.progressiverobot.com/an-introduction-to-databases/)