Special Variables
There are a number of variables provided by the Korn shell that allow you to customize your working environment. Some are automatically set by the Korn shell, some have a default value if not set, while others have no value unless specifically set.
| CDPATH | search path for cd when not given a full pathname (no default) |
| COLUMNS | window width for in-line edit mode and select command lists (default 80) |
| EDITOR | pathname of the editor for in-line editing (default /bin/ ed) |
| ENV | pathname of the environment file (no default) |
| FCEDIT | default editor for the fc command |
| FPATH | search path for auto-loaded functions pathname of the history file |
| HISTFILE | pathname of the history file (default $HOME/ .sh_history) |
| HISTSIZE | number of commands to save ... |
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