Drupal - Drush command not found after Drush completely installed

Once you have installed Drush, you need to ensure that you ~/vendor/bin directory is in your $PATH, as explained in the installation instructions (Note: this link no longer works)

Add export PATH="$HOME/.composer/vendor/bin:$PATH" to your ~/.bash_profile or ~/.bashrc, and then run source ~/.bash_profile (or ~/.bashrc).

I would recommend against installing Drush 9 via composer require at this time. Sticking with Drush 8 is probably best; if you want to use Drush 9, use a simpler installation method, such downloading the .phar, or clone the repository and run composer install in the directory Drush was cloned to.

Using ssh on my server host I did add drush to my path following composer instructions: Add

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

to your ~/.bash_profile or ~/.bashrc, and then run source ~/.bash_profile (or ~/.bashrc)

However, I got this running

    drush status
    -bash: drush: command not found

    which composer
    /opt/cpanel/composer/bin/composer

    which drush   
    /usr/bin/which: no drush in (/home/mth/.composer/vendor/bin:/home/mth/.composer/vendor/bin:/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/opt/cpanel/composer/bin:/home/mth/bin:/home/mth/bin)

Using my cPanel file manager, I found I couldn't see the hidden composer folder, though I saw other hidden folders and files (dot prefix). It turns out composer was within the .config folder. I added the new folder to my $PATH and bingo!

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

Hours! Moral? Verify composer location.