Drush is a command-line shell and scripting interface for Drupal, a veritable Swiss Army knife designed to make life easier for those who spend their working hours hacking away at the command prompt.

Installing on the cloud hosting platform can be a little bit tricky, but it should be much easier if you follow these steps. 

1) Log-in to https://control.gridhost.co.uk and activate Secure Shell on the domain you wish to use Drush with

2) Wait around 5-10 minutes for your jailshell environment to fully initialise.

3) Log-in to SSH using your favourite SSH client

4)  Now, run the following commands:-

echo "alias php='/usr/bin/php-5.6-cli'" >> .bashrc

echo "PATH=~:/usr/local/bin:/bin:/usr/bin" >> .bashrc

ln -s /usr/bin/php-5.6-cli php

So now the environment is correctly configured for your installation of Drush. 

wget https://github.com/drush-ops/drush/archive/master.zip

unzip -q master.zip

mv ./drush-master ./drush

echo "alias drush='~/drush/drush'" >> .bashrc

Drush should now be installed successfully. You should also install Composer to manage the dependencies, which you can do with the following commands:-

cd drush

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

php composer.phar install

source .bashrc