Shell script 18

Question: Usage of  $*,$1,$#,$0,$@,$?

 #!/usr/bin/bash

present_working_dir=`pwd`

echo "script name $present_working_dir/$0"

echo "1st argument $1"

echo "2nd argument $2"

echo "Previous command is success or not if yes it will give 0: $?"

echo "$*"

echo "total number of arguments $#"

echo "Arguments names $@"