Stuck. Installing Drush via Composer not working It looks like I installed Drush, following the directions in the documentation. 

Here's what I did.

Jens-MacBook-Air:~ jensimmons$ composer --version
Composer version 1.0.0-alpha8 2014-01-06 18:39:59
Jens-MacBook-Air:~ jensimmons$ composer global require drush/drush:dev-master
Changed current directory to /Users/jensimmons/.composer
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
  - Installing pear/console_table (1.1.5)
    Downloading: 100%         

  - Installing symfony/yaml (v2.2.1)
    Downloading: 100%         

  - Installing d11wtq/boris (v1.0.8)
    Downloading: 100%         

  - Installing drush/drush (dev-master a2c7030)
    Cloning a2c703071e2c3374e1b3855e24d29468b9069b5c

pear/console_table suggests installing pear/Console_Color (>=0.0.4)
d11wtq/boris suggests installing ext-pcntl (*)
Writing lock file
Generating autoload files
Jens-MacBook-Air:~ jensimmons$ drush help
-bash: drush: command not found


When I change directories, to inside a Drupal installation, I get the same result. drush: command not found.

What am I missing??
Try adding the following to the end of your /Users/jensimmons/.bashrc file:

export PATH="$HOME/.composer/vendor/bin:$PATH"


and then run

source $HOME/.bashrc


Edit:

I just noticed there was a section in the Install/Update - Composer section of the Drush README.md file that mentions this:

https://github.com/drush-ops/drush#installupdate---composer

It's the second point "Make sure Composer's global bin directory is on the system PATH (recommended)"

Hope that helps.