| 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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