Globally Composer 2 Installation

You can place the Composer PHAR anywhere you wish. If you put it in a directory that is part of your PATH, you can access it globally. On Unix systems you can even make it executable and invoke it without directly using the php interpreter.

Remove Composer:

Please remove composer using following command if already installed composer

sudo apt-get remove composer

Download:

Create a directory and open terminal, execute following command

php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
php -r "if (hash_file('sha384', 'composer-setup.php') === '906a84df04cea2aa72f40b5f787e49f22d4c2f19492ac310e8cba5b96ac8b64115ac402c8cd292b8a03482574915d1a8') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
php composer-setup.php
php -r "unlink('composer-setup.php');"

You will see a file will be created in this folder.

Move This File

After running the installer following the Download page instructions you can run this to move composer.phar to a directory that is in your path:

mv composer.phar /usr/local/bin/composer

Check

Now run composer in order to run Composer instead of php composer.phar.

saidul@saidul-Inspiron-5502:~/Downloads/soft$ composer
  ______
 / ____/___ ____ ___ ____ ____ ________ _____
 / /  / __ \/ __ `__ \/ __ \/ __ \/ ___/ _ \/ ___/
/ /___/ /_/ / / / / / / /_/ / /_/ (__ ) __/ /
\____/\____/_/ /_/ /_/ .___/\____/____/\___/_/
          /_/
Composer version 2.2.4 2022-01-08 12:30:42
...
...

or execute only

 composer --version

Output like:

saidul@saidul-Inspiron-5502:~/Downloads/soft$ composer --version
Composer version 2.2.4 2022-01-08 12:30:42