Install Composer on Linux, Ubuntu, etc.

install-composer.sh

#!/bin/bash
# Install Composer on Centos, Ubuntu, Debian
# Inspired by: https://gist.github.com/virbo/c3169ed490564f36f0c239d6fd16f749

user_allow="root"

if [ "$(whoami)" != $user_allow ]; then
        echo "==================================================================="
        echo " Falha na instalação. O composer deve ser instalado com o user: "$user_allow" ="
        echo "==================================================================="
        exit 1
fi

if [ -e /usr/local/bin/composer ]; then
        echo "==================================================================="
        echo "= Falha na instalação. O servidor já possui o composer instalado  ="
        echo "= Para atualizar, utilize o comando composer self-update        ="
        echo "================================================================="
        composer -V
        echo ""
        exit 1
fi

cd /tmp
clear

echo "================================"
echo "=       Download Composer      ="
echo "================================"
curl -sS https://getcomposer.org/installer | php

echo "==========================================="
echo "=    Make Composer globally accessible    ="
echo "==========================================="
mv composer.phar /usr/local/bin/composer
sleep 5s

if [ -e /usr/local/bin/composer ]; then
        clear
        echo "=============================================="
        echo "=       Composer instalado com sucesso       ="
        echo "= Execute o comando composer -h para ajuda   ="
        echo "=============================================="
        composer -V
        echo ""
        exit 1
fi