What is the meaning of variable $#,$@,$0,$1,$2,$*,$$,$ in Linux?

$# is the number of arguments passed to the script. $ is the name of the script itself. $ is the first parameter passed to the shell script, and the second argument that is passed to the shell script is [email protected] is a list of all the parameters passed to the script $* is to display all parameters passed to the script in a single string, unlike positional variables, which can be more than 9 $$ is the current process ID number for the script to run? is to display the exit status of the last command, 0 means no error, others indicate an error

Difference: @@*

Same point: All parameters are referenced

Different points: only in double quotes. Suppose that three parameters were written when the script was run (stored at 112 3 respectively) then "*" is equivalent to "112 3" (passing a parameter), and "3" (passing a parameter), while "@" is equivalent to "1" "1" "2" "$ $" (three parameters passed)

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Variables in Linux $#,[email protected] , $0,$1,$2,$*,$$,$? The meaning of