Special Parameters

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	Korn Shell: Unix and Linux Programming Manual, Third Edition, The By Anatole Olczak
	Table of Contents
	Appendix G.  Pdksh Quick Reference

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Some special parameters are automatically set by the Korn shell, and usually cannot be directly set or modified.

$#	number of positional parameters
$@	all positional parameters ("$1", "$2", ..., "$n")
$*	all positional parameters ("$1 $2... $n")
$?	exit status of the last command
$$	process id of the current shell
$?/span>	current options in effect
$!	process id of last background command

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