How to install drush with composer on linux box

I had trouble installing Drush on my newly created Centos box. Therefore, I have documented my steps.

First, you need install Composer ( PHP Dependency Manager) cd into the
$ cd /tmp

Download Composer.phar here

$ curl -sS https://getcomposer.org/installer | php

Then move it to /usr/local/bin so that it can be used globaly.
$ mv composer.phar /usr/local/bin/composer

Now type $composer

If you done everything right you should get something that look like this:

/ ____/___ ____ ___ ____ ____ ________ _____
/ / / __ \/ __ `__ \/ __ \/ __ \/ ___/ _ \/ ___/
/ /___/ /_/ / / / / / / /_/ / /_/ (__ ) __/ /
\____/\____/_/ /_/ /_/ .___/\____/____/\___/_/
/_/
Composer version 1.2.1 2016-09-12 11:27:19

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.

Now it time to install drush globally to your box. This is partly taken from the Drush website with slight changes

cd into the opt directory
$ cd /opt

create a directory for crush

$ mkdir --parents /opt/drush-6.x

cd into it

$ cd /opt/drush-6.x
# Initialise a new Composer project that requires Drush.

$ composer init --require=drush/drush:6.* -n
change your version if you need a new version like 7. See more instruction at the drush doc site.

# Configure the path Composer should use for the Drush vendor binaries.

$ composer config bin-dir /usr/local/bin

# Install Drush.
$ composer install

Now test you drush by typing ‘drush’

$ drush

If you have done everything right you should get drush commands shown below.

$ drush
Execute a drush command. Run `drush help [command]` to view command-specific
help. Run `drush topic` to read even more documentation.

Global options (see `drush topic core-global-options` for the full list):
-d, --debug Display even more information,
including internal messages.
-h, --help This help system.
-n, --no Assume 'no' as answer to all prompts.
-r , --root= Drupal root directory to use
(default: current directory).
-s, --simulate Simulate all relevant actions (don't
actually change the system).
-l , URI of the drupal site to use (only
--uri= needed in multisite environments or
when running on an alternate port).
-v, --verbose Display extra information about the
command.
-y, --yes Assume 'yes' as answer to all
prompts.

Core Drush commands: (core)
archive-dump (ard, Backup your code, files, and database into a single file.
archive-backup, arb)
archive-restore Expand a site archive into a Drupal web site.
(arr)

Getting updates for your packages including drush with composer

# Navigate to the Drush install path.
$ cd /opt/drush-6.x
# Run composer update
$composer update

There you have it enjoy.

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