6.1. Overview of Features

The Bash and Korn shells provide the following features:

• Input/output redirection

• Wildcard characters (metacharacters) for filename abbreviation

• Shell variables and options for customizing your environment

• A built-in command set for writing shell programs

• Shell functions, for modularizing tasks within a shell program

• Job control

• Command-line editing (using the command syntax of either vi or emacs)

• Access to previous commands (command history)

• Integer arithmetic

• Arrays and arithmetic expressions

• Command-name abbreviation (aliasing)