How to install Composer on linux system ?

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Composer provides an installer script written in PHP. We’ll download it, verify that it’s not corrupted, and then use it to install Composer.

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

 

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

 

 

Create hash Key

 

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


verify it using 

echo $HASH

it will return your key

Now execute the following PHP code, as provided in the Composer download page, to verify that the installation script is safe to run:

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

Output must be 

Installer verified 

than run below command to install composer globally,

sudo php composer-setup.php --install-dir=/usr/local/bin --filename=composer

check composer installation 

composer

if youll get path error than set alias 

alias composer='/usr/local/bin/composer'
 
Follow the below link for more clarifications
https://www.digitalocean.com/community/tutorials/how-to-install-and-use-composer-on-ubuntu-20-04  



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