Special Parameters
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 |
| $– | current options in effect |
| $! | process id of last background command |
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