第二版包括了bash Version 2.0, while still applying to bash Version 1.x. It includes one-dimensional arrays,-This second edition covers all of the features of bash Version 2.0, while still applying to bash Version 1.x. It includes one-dimensional arrays, parameter expansion, more pattern-matching operations, new commands, security improvements, additions to ReadLine, improved configuration and installation, and an additional programming aid, the bash shell debugger