$0 Name of the command being executed
$- Current shell settings
$$ PID of current shell
$? Exit status of the last executed command
$# Total number of positional parameters
$@ Similar to $*
$0 Name of the command being executed
$- Current shell settings
$$ PID of current shell
$? Exit status of the last executed command
$# Total number of positional parameters
$@ Similar to $*
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