Updates to the script to support debian-based environments.

[henrylwilliams]

Updated the script to support debian-based environments.

• Corrected some syntax for use in debian-based environments.
• Corrected an issue with using the eval command.
• Corrected 'Bad Substitution' issue.

./mysql-status.sh: 22: ./mysql-status.sh: Bad substitution
./mysql-status.sh: 1: ./mysql-status.sh: Syntax error: redirection unexpected

• Added ability to define the MySQL host.

TODO:

• Add check to see if mysql command is installed.