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$ sudo apt-get install php5-cli

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

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$ php -r "readfile('https://getcomposer.org/installer');" | php

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# install to ~/bin
cd ~
mkdir bin -p
curl -sS https://getcomposer.org/installer | php -- --install-dir=bin --filename=composer

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$ wget -c https://getcomposer.org/composer.phar

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$ chmod u+x composer.phar

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$ mv composer.phar ~/bin/composer

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$ composer

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______
  / ____/___  ____ ___  ____  ____  ________  _____
 / /   / __ \/ __ `__ \/ __ \/ __ \/ ___/ _ \/ ___/
/ /___/ /_/ / / / / / / /_/ / /_/ (__  )  __/ /
\____/\____/_/ /_/ /_/ .___/\____/____/\___/_/
                 /_/
Composer version 1.0-dev (8d6ab70ae590e84cc94871a3ee08be2b09979520) 2015-02-01 14:00:06
Usage:
 [options] command [arguments]
Options:
 --help (-h)           Display this help message.
 --quiet (-q)          Do not output any message.
 --verbose (-v|vv|vvv) Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug.
 --version (-V)        Display this application version.
 --ansi                Force ANSI output.
 --no-ansi             Disable ANSI output.
 --no-interaction (-n) Do not ask any interactive question.
 --profile             Display timing and memory usage information
 --working-dir (-d)    If specified, use the given directory as working directory.
Available commands:
 about            Short information about Composer
 archive          Create an archive of this composer package
 browse           Opens the package's repository URL or homepage in your browser.
 clear-cache      Clears composer's internal package cache.
 clearcache       Clears composer's internal package cache.
 config           Set config options
 create-project   Create new project from a package into given directory.
 depends          Shows which packages depend on the given package
 diagnose         Diagnoses the system to identify common errors.
 dump-autoload    Dumps the autoloader
 dumpautoload     Dumps the autoloader
 global           Allows running commands in the global composer dir ($COMPOSER_HOME).
 help             Displays help for a command
 home             Opens the package's repository URL or homepage in your browser.
 info             Show information about packages
 init             Creates a basic composer.json file in current directory.
 install          Installs the project dependencies from the composer.lock file if present, or falls back on the composer.json.
 licenses         Show information about licenses of dependencies
 list             Lists commands
 remove           Removes a package from the require or require-dev
 require          Adds required packages to your composer.json and installs them
 run-script       Run the scripts defined in composer.json.
 search           Search for packages
 self-update      Updates composer.phar to the latest version.
 selfupdate       Updates composer.phar to the latest version.
 show             Show information about packages
 status           Show a list of locally modified packages
 update           Updates your dependencies to the latest version according to composer.json, and updates the composer.lock file.
 validate         Validates a composer.json

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$ composer --version

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$ composer -V

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Composer version 1.0-dev (8d6ab70ae590e84cc94871a3ee08be2b09979520) 2015-02-01 14:00:06

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$ composer self-update

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$ composer selfupdate

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You are already using composer version 8d6ab70ae590e84cc94871a3ee08be2b09979520.

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$ cat ~/.profile

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# ~/.profile: executed by the command interpreter for login shells.
# This file is not read by bash(1), if ~/.bash_profile or ~/.bash_login
# exists.
# see /usr/share/doc/bash/examples/startup-files for examples.
# the files are located in the bash-doc package.
# the default umask is set in /etc/profile; for setting the umask
# for ssh logins, install and configure the libpam-umask package.
#umask 022
# if running bash
if [ -n "$BASH_VERSION" ]; then
    # include .bashrc if it exists
    if [ -f "$HOME/.bashrc" ]; then
    . "$HOME/.bashrc"
    fi
fi
# set PATH so it includes user's private bin if it exists
if [ -d "$HOME/bin" ] ; then
    PATH="$HOME/bin:$PATH"
fi