Bash is a shell program from the GNU Project that is sh-compatible and incorporates features from the Korn shell and the C shell. It offers functional improvements for programming and interactive uses, and most sh scripts can be run by Bash without modification. It is maintained by Chet Ramey and is licensed under the GNU General Public License. Membership, donations, and shopping in their store can help support the Free Software Foundation's cause.
don't have tea/gui yet? download here
Copy the tea one-liner above into your terminal to install bash. tea will interpret the documentation and take care of any dependencies.