Command line arguments

 $0 Shell script name or command

$1–$9 Positional parameters 1–9

${10} Positional parameter 10

$# Total number of parameters

$* Evaluates to all the positional parameters

$@ Same as $*, except when double quoted

"$*" Displays all parameters as "$1 $2 $3", and so on

"$@" Displays all parameters as "$1" "$2" "$3", and so on 

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