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 in history file (default 128) |
HOME | home directory |
IFS | internal field separator (default space, tab, newline) |
LINES | specifies column length for select lists |
name of mail file | |
MAILCHECK | specifies how often to check for mail (default 600 seconds) |
MAILPATH | search path for mail files (no default) |
OLDPWD | previous working directory |
OPTARG | value of the last getopts option argument |
OPTIND | index of the last getopts option argument |
PATH | search path for commands (default /bin:/usr/bin:) |
PPID | process id of the parent shell |
PS1 | primary prompt string (default $, #) |
PS2 | secondary prompt string (default >) |
PS3 | select command prompt (default #?) |
PS4 | debug prompt string (default +) |
RANDOM | contains a random number |
REPLY | contains input to read command when no variables given |
SECONDS | contains number of seconds since Korn shell invocation |
SHELL | pathname of shell |
TERM | specifies your terminal type (no default) |
TMOUT | Korn shell timeout variable (default 0) |
VISUAL | pathname of the editor for in-line editing |
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