Open System Services Shell and Utilities Reference Manual (G06.25+, H06.03+)

User Commands (k - l) ksh(1)
LINENO
The line number of the current line within the script or function being executed.
OLDPWD
The previous working directory set by the cd command.
OPTARG
The value of the last option argument processed by the getopts special command.
OPTIND
The index of the last option argument processed by the getopts special command.
PPID The process number of the parent of the shell.
PWD The present working directory set by the cd command.
RANDOM
Each time this parameter is referenced, a random integer, uniformly distributed
between 0 and 32767, is generated. The sequence of random numbers can be initial-
ized by assigning a numeric value to RANDOM.
REPLY This parameter is set by the select statement and by the read special command when
no arguments are supplied.
SECONDS
Each time this parameter is referenced, the number of seconds since shell invocation is
returned. If this parameter is assigned a value, then the value returned upon reference
will be the value that was assigned plus the number of seconds since the assignment.
The following parameters are used by the shell:
CDPATH
The search path for the cd command.
COLUMNS
If this variable is set, the value is used to define the width of the edit window for the
shell edit modes and for printing select lists.
EDITOR
If the value of this variable ends in vi and the VISUAL variable is not set, then the
corresponding option (see set under Special sh Commands) will be turned on.
ENV If this parameter is set, then parameter substitution is performed on the value to gen-
erate the pathname of the script that will be executed when the shell is invoked. (See
Invocation.) This file is typically used for alias and function definitions.
FCEDIT
The default editor name for the fc command.
FPATH The search path for function definitions. This path is searched when a function with
the -u attribute is referenced and when a command is not found. If an executable file is
found, then it is read and executed in the current environment.
IFS Internal field separators, normally spaces, tabs, and newlines that are used to separate
command words which result from command or parameter substitution and for separat-
ing words with the read special command. The first character of the IFS parameter is
used to separate arguments for the $* substitution. (See Quoting.)
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