How to install drush on shared hosting :
1. Go to your server like
2. Go to your home folder by typing
3. Type this
(I have not used drush 7 because it needs composer, so i was unable to install composer on shared hosting, if you help me in that i can buy a coffee for you)
4. Edit .bashrc file in your favorite editor may be nano, vi or vim.
5. Look for
# User specific aliases and functions
and add this alias to it
6. Refresh bashrc with this command
Enjoy Drupal development @ command line.