updated: April 8th, 2016
updated: April 29th, 2016
updated: March 25th, 2017
Here's how I switch Drush versions using Bash aliases, Composer, and Git. Much of this was taken from https://www.lullabot.com/articles/switching-drush-versions.
Install composer globally
In the terminal:
curl -sS https://getcomposer.org/installer | php mv composer.phar /usr/local/bin/composer
If the above fails due to permissions, run the mv line again with sudo.
Add the following line to the top of your ~/.bash_profile (you might need to create this file if it doesn't exist):
Install 4 different versions of Drush with Composer and Drush 5 with git
I have a directory on my computer for all things related to Drupal in my home directory: "~/drupal". In this directory, I have 4 folders, one folder for each version of Drush that I want. I have installed each version of Drush with Composer, except for version 5, which is not supported by Composer. Here's the commands I used:
mkdir ~/drupal/drush9 cd ~/drupal/drush9 composer require drush/drush:9.x@dev mkdir ~/drupal/drush8 cd ~/drupal/drush8 composer require drush/drush:8.x mkdir ~/drupal/drush7 cd ~/drupal/drush7 composer require drush/drush:"7.*" mkdir ~/drupal/drush6 cd ~/drupal/drush6 composer require drush/drush:"6.*" cd ~/drupal git clone email@example.com:drush-ops/drush.git drush5 cd ~/drupal/drush5 git checkout 5.x
Make some handy bash aliases for switching versions
In my ~/.bash_profile, I have the following helpful aliases:
alias drush5='~/drupal/drush5/drush' alias drushup5='git -C ~/drupal/drush5 pull' alias drushuse5='alias drush="~/drupal/drush5/drush"' alias drush6='~/drupal/drush6/vendor/bin/drush' alias drushup6='PREVIOUSDIRECTORY=`pwd` && cd ~/drupal/drush6 && composer update && cd $PREVIOUSDIRECTORY' alias drushuse6='alias drush="~/drupal/drush6/vendor/bin/drush"' alias drush7='~/drupal/drush7/vendor/bin/drush' alias drushup7='PREVIOUSDIRECTORY=`pwd` && cd ~/drupal/drush7 && composer update && cd $PREVIOUSDIRECTORY' alias drushuse7='alias drush="~/drupal/drush7/vendor/bin/drush"' alias drush8='~/drupal/drush8/vendor/bin/drush' alias drushup8='PREVIOUSDIRECTORY=`pwd` && cd ~/drupal/drush8 && composer update && cd $PREVIOUSDIRECTORY' alias drushuse8='alias drush="~/drupal/drush8/vendor/bin/drush"' alias drush9='~/drupal/drush9/vendor/bin/drush' alias drushup9='PREVIOUSDIRECTORY=`pwd` && cd ~/drupal/drush9 && composer update && cd $PREVIOUSDIRECTORY' alias drushuse9='alias drush="~/drupal/drush9/vendor/bin/drush"' # Uses v8 for default alias drush='drush8' alias drushup='drushup8'
These aliases make it so Drush 7 is used by default. There are aliases to switch the current drush version, and to update specific versions.