Need guidance installing Drush I have successfully installed composer, but when i try to install drush and modify the .~/.bashrc file it returns Content-Type: text/html when i run any kinda of drush command.

Anyone seen anything like this? Sorry can't be more specific but can get you  any info you need to be helpful..
If you see Content-Type: text/html when running Drush commands, it means that you are running Drush with php-cgi instead of php-cli.

If you already have php-cli on your system, set the environment variable DRUSH_PHP to point to the full path of php-cli.  If you do not have it installed yet, try installing it and see if that clears up your trouble (sudo apt-get install php5-cli on Ubuntu).