Overview of features
Arithmetic expressions (Korn shell only)
Command history (Korn shell only)
Invoking the shell
The Bourne shell is the standard shell and provides the following features:
Wildcard characters (metacharacters) for filename abbreviation.
Shell variables for customizing your environment.
A built-in command set for writing shell programs.
Job control (beginning in SVR4).
The Korn shell is a backward-compatible extension of the Bourne shell. Features that are valid only in the Korn shell are so indicated.
Command-line editing (using vi or emacs).
Access to previous commands (command history).
More ways to match patterns and substitute variables.
Arrays and arithmetic expressions.
Command name abbreviation (aliasing).